Weapon Title

This is one of the simplest ways of naming a work of fiction. Weapon Title is where the titular arsenal is used in the title.

A subtrope of MacGuffin Title, but one should remember the key element is that the eponymous weapon should be integral on fighting, destroying, or/and defending someone or/and something within the story to count. Since the eponymous weapon can take many forms, it can overlap with other Title Tropes.

Examples:

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Anime & Manga

The Big O refers to The Hero's Humongous Mecha, thus doubling as a Vehicle Title.
Cardcaptor Sakura. The protagonist uses Clow Cards to defeat her opponents.
Code Geass. Geass refers to the Villain Protagonist and various characters' Magical Eye which has different set of powers.
Death Note is the Villain Protagonist's means for killing those he views as "poor excuses for humans".
Demonbane refers to the Humongous Mecha piloted by The Hero, thus doubling as a Vehicle Title.
Flame of Recca. The Hero has fire powers and uses it against several antagonists.
Gundam refers to the various Humongous Mecha in the franchise, thus doubling as Vehicle Title.
Neon Genesis Evangelion refers to the main characters' various Humongous Mecha, thus doubling as a Vehicle Title.
Tengen Toppa Gurren Lagann refers to the main characters' Combining Mecha, thus doubling as a Vehicle Title.
Trigun refers to The Hero's three guns; his silver revolver, his left Arm Cannon, and his organic Wave-Motion Gun.
Vandread refers to the main characters' various Combining Mecha, thus doubling as a Vehicle Title.
The Vision of Escaflowne : It's actually a Double-Meaning Title. The female protagonist is a Seer while Escaflowne is the male lead's Humongous Mecha, thus doubling as a Vehicle Title.
Witchblade is an Anime Adaptation of the comics of the same name; see Comic section below.

Comic Books

Green Arrow: The Hero is an archer who mainly wields green-colored bow and arrows. Doubles as Protagonist Title as it's also his Code Name.
Green Lantern also refers to the eponymous team's Ring of Power which is dubbed as Lantern Rings.
Silverblade, although it is not a straightforward case as 'Silverblade' also refers to a character and a film.
Starslayer: The weapon Torin used to collapse Sol into a black hole was a 'Starslayer Missile'. Refugees from this cataclysm later started referring to Torin himself as 'Starslayer'.
Tomahawk: Doubles as a Protagonist Title, as it refers to both the hero's nickname and his weapon of choice.
Witchblade refers to the empathic gauntlet that The Hero wields.

Films — Animation

Frozen (2013): One of the two protagonists is An Ice Person and uses said powers throughout the film to protect herself from those she views as "threats".
Quest for Camelot relead in some countries under the title The Magic Sword: Quest for Camelot.

Films — Live-Action

A really common trend in wuxia movies especially if Shaw Brothers are involved, such as Full Moon Scimitar, Flying Guillotine, The Dragon Missile, The Golden Sword, The Sword of Swords and The Killer Meteors.
.45 refers to the calibre of handgun used to murder Clancy and frame Big Al.
AK-47: Biopic of the eponymous gun.
Day of the Evil Gun: A storekeeper declares the protagonist's weapon to be an 'evil gun' because of the lives it has taken.
Excalibur refers to The Hero's iconic Cool Sword.
Finger of Doom is the title of the main villainess' Wolverine Claws, an enchanted weapon that allows her to slay her victims, and then resurrect them as her zombified serfs.
Fist of Fury: The Hero and the villains are martial artists.
The Gatling Gun: US Cavalry and Apaches fight for possession of the eponymous weapon.
GoldenEye doubles as Antagonist Title since it refers to the bad guys' Kill Sat.
Hatchet refers to undead Big Bad's weapon of choice.
The Man with the Golden Gun doubles as Antagonist Title since the wielder is the film's Big Bad.
The Nail Gun Massacre is about Exactly What It Says on the Tin.
The Naked Gun film trilogy, starring the late Leslie Nielsen as a gun-wielding police officer.
Parasite Eve: Live-Action Adaptation of the novel of the same name; see Literature below.
Pitchfork is about a killer with a pitchfork for a hand killing people on a farm.
Rimfire refers to an ammunition type.
Shotgun: Also a One-Word Title:
- Shotgun (1955): The weapon of choice of the Big Bad. The hero starts carrying one as well when he rides the vengeance trail.
- Shotgun (1989), which is also the central character's nickname, making it a Protagonist Title as well.
Six Gun Savior: A Weird Western about the Devil's bounty hunter.
Stiletto. Protagonist Raina's preferred weapon is a switchblade stiletto.
The Texas Chainsaw Massacre 1974 and its sequels, since the villains are deranged cannibals who use chainsaws to cut up their victims.
Web of Death: The titular weapon can kill an entire room of unfortunate mooks in seconds.

Literature

Death Star refers to the main antagonists' Kill Sat.
Dragonlance is named for the titular lances, legendary weapons that are among the only weapons that a mortal can kill a dragon with.
The Elric Saga novel Stormbringer, which is about the adventures of Elric of Melnibone as he wields the powerful runesword Stormbringer.
Firestarter features a girl with destructive fire powers.
Merkabah Rider: The title of the novella "The Infernal Napoleon" actually refers to a demonic cannon^note.
Parasite Eve: The titular antagonist has evolved cells which also gave her abilities to manipulate other living creatures' bodily structures.
A Storm of Swords refers to the war and chaos that befell the Kingdom of Westeros causing several clashing of swords—both literally and figuratively.
The Subtle Knife, which is the second book of the His Dark Materials trilogy.
Sword of Truth refers to The Hero's primary arsenal.

Live-Action Television

Arrow is a Live-Action Adaptation of Green Arrow; see Comic section above.
Queen of Swords: The title says it all; it's about The Hero and her weapon of choice.
Witchblade is a Live-Action Adaptation of the comics of the same name; see Comic section above.

Radio

"The man in the saddle is angular and long-legged. His skin is sun-dyed brown. The gun in his holster is gray steel and rainbow mother-of-pearl, its handle unmarked. People call them both The Six Shooter."

Tabletop Games

Battleship: The game is about maritime combat involving the eponymous ships. Obviously doubles as Vehicle Title.
Warhammer refers to the weapon of choice of various characters in the game.

Video Games

Fire Emblem takes its name from the shield of the same name, also known as the Shield of Seals or Crest of Flames depending on the specific game. Various titles in the series also refer to weapons within the respective series.
Halo refers to the seven eponymous ringworlds, which are also superweapons capable of destroying all life in the galaxy.
Heavenly Sword refers to the empathic sword wielded by The Hero.
Krut: The Mythic Wings have the titular Mythic Wings, a set of legendary ancient silver armor used by the ancient Krut warriors to defeat the stone ogres. You're seeking the armour in order to save your homeland when the stone ogres inevitably returns.
The Legend of Dragoon: The Dragoon mode serves as a timed Super Mode to the protagonists, giving them Powered Armors, flight capabilities (except for one member who is naturally capable of flying), weapon upgrades, and basic elemental magic (and Summon Magic if the player is able to max a characters' Dragoon level).
Lufia II: Rise of the Sinistrals's German translation renamed the Dual Blade to Lufiaschwert^noteLufiasword to give it this sort of title (Lufia & The Fortress of Doom, the only game in the series with the character named Lufia, wasn't released in Europe).
Metal Gear refers to the various Humongous Mecha throughout the series. Doubles as Vehicle Title.
Parasite Eve: Video Game sequel of the novel of the same name; see Literature above.
The Soul Series does this. The first game is titled Soul Edge and is named after a sword with terrible powers. The sequel is titled Soulcalibur which refers to another sword with powers that can counteract Soul Edge.
Sniper Elite V2. The "V2" portion refers not only to this game's status as a Continuity Reboot (i.e. "version 2"), but also because the game's plot focuses on the V2 rocket, a Nazi wonder-weapon. Specifically, Karl Fairburne, is ordered by the OSS to: (1) Assassinate key German military officers and scientists willing to sell out to the Soviets in exchange for their knowledge on the weapon; and (2) Destroy any V2 rocket facilities remaining within Germany. Late in the game, Karl even finds out about an Evil Plan by the Soviets to load a single V2 rocket with Tabun, launch it at London to test the lethality of the gas, and promptly blame it on the dying Third Reich.
Syphon Filter refers to the biological weapon the antagonists are trying to distribute.
X-Kaliber 2097 is the name of the Cool Sword you use to kick absurd amounts of ass throughout the game.