The Knight Exemplars of Lord of Dragons all have these sorts of names: Robespierre de Fortescue Von Garamond-Lily the Murderer of Eighty-Seven Babies And An Adorable Puppy, Guy de Verigengen Van Gervenger-Vergenven-Geodendag the Vicious Attacker of Grannies With Bags Of Shopping And Zimmer Frames, and Hector de Payens-Wayans-Rochefort-Wensleydale Smyth-Smith-Culverin-Willoughby-Wallaby-Wallace the Third, who has no title as his name is too long anyway.
Played for Laughs in the Nostalgia Critic's Godzilla review. There is a running gag in the video that noone can pronounce one of the characters names
NC Good old Testosterone-
Nick: It's Tatopoulos.
NC Mr. Tapdancelous-
Nick: It's Tatopoulos.
NC (voiceover): So after that we see Audrey, as she comes across Mr. Tackanovahumpashirerickydickyhamstermasterpollywollywannabingbangsupercalifragilisticnickknackpaddywhackgiveadogabananafannafofrescahickorydickoryhocketypocketywocketyangelinafrancescathethird
Nick: It's Tatopoulos!
NC (voiceover): Whatever.
In The Leet World, the leader of the terrorists' little backyard band has his name standing at five words: Cortez Amelio Alejandro Jesus Cardinal.
Homestar Runner has Fhqwhgadshgnsdhjsdbkhsdabkfabkveybvf. This holds the dubious record of the longest string of consonants in the series - sixteen to be exact. Strong Bad managed to pronounce the whole thing once, but quickly shortened it to Fhqwhgads because in the time it took him to say that, he could have made a painting of a guy with a big knife.
The second episode of Lego Pirate Misadventures has the guys run into a "Stereotypical Islander Guy" named Oogydoogbergsonmargolatitudekaypainkismitelephantlatrinetweaksmithpassportmoisttoiletteninetytwonincorbluepoquipsibowlinggreendelsinatraartistformallyknownasooganderson, though the following episode simplified it as "Oogey Boogson".
His father's name is even worse. Oogydoogbergsonmargolatitudekaypainkismitelephantlatrinetweaksmithpassportmoisttoiletteninetytwonincorbluepoquipsibowlinggreendelsinatraartistformallyknownasooganderson is about forty-five now, his dad's been telling him his name since he he was three.
Psycomedia discusses various long-named psychologists, most prominently Csikszentmihalyi.
In the Orion's Arm universe, one archailect has a name described as "apparently a mathematical real function consisting of no less than 46.3 sextillion terms; it is believed there is some short representation but none has been found by lower toposophic entities, although one posthuman observer claimed that it was simply a Taylor polynomial approximation of the sine function around x = 2 ^ 1e+(1e+(1e+100))"
On that vein, while not nearly as long (from what we've read), Precious full name is Precious Angelique Marie Margaux Merlotte Yvette Elizabeth Bethesda Mina Fleur Adelaida Lucille Belle Bijou Cheri Antoinetta Violetta Gisellia Begonia Geranium Genevieve Francheska Charlotte Tulipe Neige Elise Rose Rouge Ulrike Camille Elle Ella Rosemarie Evangeline Angeline Chastete Blanche Glace Pointue Irene Chartreuse Hortensia Hortense Lafayette Lafayetta and so on DeBours'e
From WikiKillerbunnies: We get Visceraline, whose apparent real name was "Vladimira Lenora Agnes Belladonna Lucretzia Josephine Henrietta Rowena Philomena Theodosia Emmeline Evangeline Mahulda Fidelia Constance van Maydestone-Strangewayes"
To a lesser degree we get Fae's real name being Fleurdelice Belladonna Fae Chantrea Enderstone and Hyacinth's being "Hyacinth Angelica Cerise Blumenthal"
Those are just about a few we hear, apparently, the artist liked to write long names.
Cranky: My name be Crankydoodledinkledonkeydoodledee, the Fourth, but you can just call me Crankydoodledinkledonkeydoodledee, The. Pinkie: No, that's stupid. I'ma just call you Cranky.
Welcome to Night Vale has the Desert Flower Bowling Alley and Arcade Fun Complex. which is always said in its entirety. There's also the Faceless Old Woman Who Secretly Lives in Your Home, but her name is usually shortened to Faceless Old Woman.
Critical Role has the illustrious gunslinger PC Percival Frederickstein von Musel Klossowski de Rolo III. You can call him Percy. Played for laughs in Episode 30, when the rest of the players try to say his name and get it horrendously wrong...and then he tries to say it himself, and also gets it wrong.
ITV in the Face: in the Tyne Tees episode, one of the speculative names for the station was the long and unwieldy "The Tyne And The Wear And Also The Tees Television".
A later episode has Magnus ask "Kitten" for his full name. He's a Custodes, so they just skip forward to Magnus getting bored and telling him to stop halfway through.
Hello From The Magic Tavern has Usidore, Wizard of the 12th Realm of Ephysiyies, Master of Light and Shadow, Manipulator of Magical Delights, Devourer of Chaos, Champion of the Great Halls of Terr'akkas. The elves know him as Fi’ang Yalok. The dwarves know him as Zoenen Hoogstandjes. He am also known in the Northeast as Gaismunēnas Meistar.
A minor character from Hellsing Ultimate Abridged goes by the name Father O'Malley'O'Connel'O'Carrol'O'Reilly'O'Brian'O'Sullivan (who is also Italian)note in the original series, he goes by Father Renaldo. In episode 6, there's also the commander of the Catholic Italian forces, as well as the name of the forces itself.