A person usually has one legal name and hence one of each type of ID with that name. After all, that's the point of an identity document: to distinguish a particular person, including categorizing them by their nationality. When someone has several (three or more) of the same kind of identity document, that's a sign there's some kind of chicanery going on. The person may be a spy, or they're involved in some sort of fraud or confidence game.
This trope generally plays out one of two ways: a person has multiple examples of the same type of identification when they should only have one (several US driver's licenses from different states, or several passports from different countries), or the person has multiple forms of ID with different names on them, usually visually linked by having photos of the same person. In either case, the collection of identity documents implies that this person is involved in something shady.
Often another character makes the discovery, with the audience either privy to it or hearing about it in later dialogue. Sometimes though, no other character is shown finding the IDs, rather the person who has them is shown to audience retrieving the collection or selecting one of them for use. If the person discovering the cache of documents is seeing pictures of themselves on the IDs and doesn't know why, then Amnesiac Dissonance is probably in play.
- The first episode of Eden of the East has the amnesiac Akira discover a bunch of passports with his face on them- in this case, they are all Japanese passports, but each has a different name on them, leading Akira to speculate that he might be a spy/assassin/terrorist. Since Akira is a Pop-Cultured Badass, he specifically references the Bourne films.
- The "Brief Lives" arc of The Sandman begins with a number of unnaturally long-lived people unexpectedly dying. One of them has a son who discovers a stash of passports and other ID documents in different names that he'd accumulated since the beginning of civilisation, and eventually decides to destroy them.
- Robin Series: To avoid being caught as hes on multiple wanted lists the villain Jaeger has a number of IDs, one such being Dieter Hohenzollren, and he's rather annoyed when Robin hands the GCPD his real name.
- In Red Robin Tim is carrying a few sets of IDs on him as he travels the world tracking down the clues to Bruce's location. It's a good thing he is because Ra's Al-Ghul burns Tim's Go-to Alias pretty quickly by getting him on international wanted lists as a violent thief.
- In Parthenogenesis, Maggie first realizes that her mother Carmen Sandiego is after breaking into her safe and finding, amongst other things, various passports for both of them.
- The Bourne Identity. The protagonist has amnesia, so is relieved when he finds a US passport in the name of Jason Bourne in a safety deposit box. He then goes on to discover a pistol, a lot of cash, and several passports from different countries, all with his face but different names.
- Charade: As Reggie Lampert is being questioned about her husband Charles' death, the inspector begins holding up several passports from different countries, each bearing Charles' picture and a different name. Later she laments that for years all she knew about him was his name, and now it turns out she didn't even know that.
- The protagonist of Duplicity is a Double Agent and has a box with several passports and stacks of different currencies stashed away in his apartment.
- The Family: When Warren is planning to run away so his family don't get in trouble by the Feds, he is rummaging through the house when only he and Belle are home, gathering stashes that are hidden but also a multitude of fake IDs. Not only are they of different kinds, the different identities have a collection of nationalities. Belle then catches him and comments on the quality of one of the fake passports. It's surprising she, or anyone else, hadn't noticed before, though, because they were collected in a drawer in (rather) plain sight.
- Tomb Raider (2018): While going through her father's research on Himiko, Lara discovers he has multiple passports from different countries, each with a different name, causing her to realize he was up to something possibly shady and/or dangerous.
- Early in The Bourne Identity, the amnesiac Jason Bourne discovers a bunch of passports with his face on them, which is one of his first hints that he was involved in something shady before he had amnesia. It turns out that Jason Bourne doesn't exist and is a front used to take credit for a bunch of unrelated killings, and the guy who "played" Bourne had to memorize all of these cover details- which is the stuff he started remembering after getting amnesia.
- In Diplomatic Immunity by Lois McMaster Bujold, a suspicious character is arrested and found to be in possession of IDs in a variety of names. In a variation, only a few of them have his face on; it turns out that the others belonged to his deceased partners, whose deaths he is out to avenge.
- Robert A. Heinlein's novel Friday. After Friday kills a man who was following her, she finds a passport and an assortment of credit cards and other ID's on him. They have four different names: "Adolf Belsen", "Albert Beaumont", "Arthur Bookman" and "Archibald Buchanan".
- In A Shilling For Candles by Josephine Tey, Herbert Gotobed is a con artist who has run religious scams across the world. When the police catch up with him, they find among his belongings four passports from three different countries, all with different names.
- The Day of the Jackal. The unnamed Professional Killer hired to assassinate Charles De Gaulle acquires several fake identities as part of his meticulous preparations. He turns out needing all of them as the manhunt by the French and British authorities exposes one after another. In fact the reader never discovers who the Jackal really is — the only major clue turns out to be yet another false identity.
- Star Trek: The Original Series episode "Assignment Earth". Gary Seven uses his computer to create a variety of IDs for U.S. governmental agencies, including that of a colonel in both the CIA and NSA and a lieutenant in the NYPD Homicide department.
- In Remington Steele, Laura Holt discovers "Steele" has multiple passports, each with a name of a character portrayed by Humphrey Bogart. It not only indicates his shady past as a con man, it helps keep going the Running Gag that no one knows his real name.
- Inverted in an episode of Mad About You where Paul, Ira, Fran and Lisa all get college IDs with Jamie's name on them when they try to help Paul cover the fact that he hadn't sent in Jamie's college application when he was supposed to. They all sign up for classes in Jamie's name, and they all have to get their ID at the end of the process.
- Smallville: The Smallville version of The Flash is a young conman with a bunch of different IDs under various aliases, including Jay Garrick, Wally West and Barry Allen.
- In the Murdoch Mysteries episode "The Annoying Red Planet", Brackenreid, Murdoch and Crabtree are searching the last known digs of a dead man when Brackenreid finds several passports for the man in different names, one of which is that of a conman that Higgins mentioned at the start of the episode. It turns out the man was a French spy checking out a military dirigible project, and he was killed at the orders of the Canadian government agent running the operation—one Terrence Myers.
- Early in Orphan Black, Sarah Manning impersonates her look-alike (who had just committed suicide), Beth Childs, and posing as Beth, goes to the Bank to steal Beth's money. In Beth's safety deposit box, Sarah discovers a bunch of passports with her/Beth's face on them. It turns out that Sarah, Beth, and all these other people are clones.
- In the pilot of Person of Interest, the hero is equipped with six different cover identities by his Mysterious Employer Harold Finch.
- Early on in The Blacklist, the protagonist, Elizabeth Keen, discovers a box buried in the yard which contains a bunch of cash, a gun, and various passports with her husband, Tom's face on them. Tom is a mild-mannered teacher, but evidence starts to mount that he's actually an assassin. A later episode of the show clears Tom/indicates he was set up, but later on, it turns out he really is a spy and assassin.
- In season nine of Trailer Park Boys, after an alleged retired SAS Colonel is hired to provide security for the park (now a retirement village). Randy searches his room and finds several fake IDs and a real Canadian Forces ID revealing Colonel Dancer is actually a Private in a local Reserve regiment.
- Happens in Belgian cop/political thriller Salamander. A hit-man working for the Salamander group note loves to play dangerously. He seduces the daughter of one of his employers. Later in the night, she gets curious about the man and checks out his home. She discovers a drawer full of passports in various nationalities and names - all with his face.
- Leverage: Hardison made each member of the team several alternate identities, complete with identifying documents, for any cons they may need to run.
- The Pretender: In the episode "Jarod's Honor", one of the indications that tells Jarod (and the audience) that the hitman isn't just an innocent traveler is that he has multiple driver's licenses in his luggage, each from a different state and bearing a different name, but all with the same photo.
- Supernatural: As the brothers often need to impersonate authority figures to get the information they need to solve their cases, they have a pile of various IDs including FBI and CDC, plus they stock fake health insurance cards for if they ever have to go to the hospital (and Dean has fake business cards he uses to pick up women, like Hollywood talent scout). In a variation, Bobby also has multiple phones at his house labeled as government agencies, which he uses to pretend to be other hunters' superiors and back up their stories in case real cops ever get suspicious.
- Imposters focuses on Maddie, a professional con artist who marries marks under a variety of identities and takes them for their cash. The beginning of season 2 has a on-the-run Maddie hitting a storage locker which is packed with dozens of fake identities (complete with social security cards), cell phones, disguises and what appears to be thousands of dollars in cash in various currencies.
- Wiseguy. Mob boss Sonny Steelgrave isn't happy to find that Vinnie Terranova has a driver's license showing that he lived for a time in Quantico, where they train federal agents. Vinnie argues this trope to explain it away; he has multiple ID from different states, because if he's asked for ID by a cop from one state he shows a driver's license from another to make it look like he's just passing through.
- Shadowrun: Fake System Identification Numbers are standard Runner equipment, the higher the rating the better it will stand up to close inspection (and more expensive). It also helps that most Runners don't have legitimate SINs in the first place, either from being born outside the system, losing their SIN in one of the crashes, or burning it when they turned to a life of crime.
- One entrant in Papers, Please will accidentally hand you two passports. They'll both have his photo, but different names and countries of origin. Your "detain" button pops up immediately. Subverted with several other entrants, who have a different name on supporting documents, claiming I Have Many Names if this is pointed out. A fingerprint check usually clears this up, showing the person's known identities and fingerprints on file.
- In one episode of The Simpsons, Bart begins to think something is amiss when he meets his estranged Grandmother for the first time, and finds she has multiple driving licenses. It turns out she's been on the run from the law ever since she and her hippy friends sabotaged a germ warfare lab in the 60's.
- On the Gravity Falls episode "Not What He Seems", Grunkle Stan is arrested and the twins look inside his office for proof of his innocence. One of the things they find is a box full of fake IDs, which was explained on the following episode, "A Tale of Two Stans", as him having to change his identity every time he was run out of town for selling shoddy merchandise.