Exeter: H.M.S. Exeter, a York-class heavy cruiser; survived the battle against the German warship Graf Spee only to be sunk later by the Japanese.
Jambiya (FFTA): A 19th-century Arab dagger, usually long and curved, and meant to be carried in a belt.
Joyeuse (FFTA): The name of Sir Lancelot's sword.
Kaiser Knuckle: Kaiser is the name for an emperor in the Germanic languages (e.g. Kaiser Wilhelm). It's probably a smudging of "Cesar" (Rome overran the Gauls, who lived around Germany, back in the early A.D.'s). I've even seen in the Talmud (dating back to the same period) that Roman kings are referred to as "keisar" in Aramaic.
Khukuri (FFTA): A 'khukuri' is a type of sword originating from Nepal.
Kikuijimonji: "Kiku" means chrysanthemum. "Ichimonji" can refer to the Japanese kanji for "one", but I think that in this case, it refers to the "Ichimonji", a group of swordsmiths who aided the Emperor Gotoba in developing swords. Apparently, Emperor Gotoba was an avid swordsmith. With the help of the Ichimonji, he commissioned many swords (and supposedly made a few). However, the Emperor was not permitted to sign his name on the sword, so he used a chrysanthemum with 16 or 24 petals. Hence, the name "kikuichimonji". (See also here and here)
Kiyomori (FF Tactics): A Japanese shogun.
Kotetsu: A Japanese sword that is shorter than a Katana but is longer than a Wakizashi. Its shorter length gives it more defensive
abilities than the Katana. It is sometimes called Naga-Wakizashi, which means "long Wakizashi". This description seems to fit the Kodachi, a weapon used by Ninjas in FF5 and Shadow in FF6. "Kotetsu" refers to swords made by Nagasone Kotetsu (Nagasone probably refers to the place where he came from.) Kotetsu started out making armor but ended up making swords, and that Kotetsu means "iron tiger". The swords were normal katana length, not kodachi-length.
Kris (FFCC): A kris is an Indonesian ritual dagger that often has a curved, serpentine blade.
Kunai: Multi-purpose tools "used to help climb trees and walls", and also "for probing, digging, and chiseling". Or at least, that's what this site claims." Since it's a ninja weapon, that'd make sense for the climbing abilities.
Kwigon Blade (FFTA): The name should have been Qigong Blade. Qigong is a self-healing art that combines movement and meditation. Visualizations are employed to enhance the mind/body connection and assist healing.
Laevatein (FF10): Yuna's weapon Laevatein was taken from a magic wand in Norse mythology of the same name, forged by god Loki. The name Laevatein means, "Lie Stick" or "Wand of Destruction". This has the S.O.S. Overdrive ability.
Largamente (FF10): Largamente probably comes from a Spanish word, 'largamente', which means, 'at length; generously or liberally'. This sword has slowstrike.
Lohengrin (FFTA): A play by Richard Wagner (the guy who brought us the famous "Ride of the Valkyries," among other things)
Longinus (FF7, FF10): This was changed to 'Spirit Lance' in the American version, although this is its name in FF7 (JP) and FF10 (JP). It was the weapon that pierced Christ's side after they took him down from the cross, and also the name of the Roman centurion who used it. Supposedly, the holder of this weapon would be granted immortality, and it has also been said that Hitler was looking for this during World War II. It's also the name of a Greek philosopher, but that's probably a coincidence. (It's in Bahamut Lagoon as well).
Last Letter (FFTA): This is most likely a reference to Zorro. The L.L. is a rapier (The kind of sword Zorro used). The last letter in the alphabet is "Z". Zorro would score a "Z" WITH the tip of said rapier as a means of leaving his mark. This origin is backed up by the fact that Square has used a similar name, "Final Letter," as an Epee tech in Romancing SaGa 3.
Manganese (FFTA): Element #25 on the Periodic Table, and is used in making stainless steel, among other things.
Main Gauche: This is French for "left hand". It's a knife with some defense ability. They're daggers, not swords, with big curvey hand-guards. You would have a rapier in your right hand which you would fight with, and you would use the big hand-guard on the main-gauche to block any blows from an opponent, assuming he was fighting with a rapier (if he had a big heavy sword then a main-gauche wouldn't do a fat lot of good).
Marduk Bow (FFTA): Marduk was an ancient Babylonian god. See Mythincal-Folk for more.
Masamune: One explanation is that there was a feudal lord named "Masamune Date" (Date (da-te) is the family name) who ruled Rikuzen (area near Sendai) around the early 1600's. He lost one of his eyes due to sickness in childhood, and he was nicknamed "Dokuganryuu Masamune" (Masamune, the one eyed dragon). Another story says that there was a blacksmith named "Masamune", and his sword was so sharp that you could drive it into the ground in a lake, and leaves that floated by would float around the Masamune due to its holy power. Masamune is actually the name of a Japanese swordsmith from the 11th-12th centuries; the weapons are in display in museums. It's quite possible that the swordsmith's name is based on the legends. "Masamune" refers to swords crafted by Goro Nyudo Masamune (around 1265-1358), one of the most famous Japanese swordsmiths. According to Japanese legend, the Masamune blade was the most powerful sword in all the world. When piercing the flesh, it would shed no blood, as the Masamune was not "bloodthirsty", which explains why no blood was shed when Sephiroth killed Aeris in FF7.
Medusa Arrows (FF4): Named for the woman of Greek legend who could turn people to stone by looking at them. She had snakes for hair.
Murasame: The characters are "town" (mura) and "rain" (ame). Murasame is used to define a rain that rains in small area (sometimes
quick rain). Thus, it could mean Murasame can cause "quick blood rain". And in some stories, Murasame is cursed. Though the leaves floating
down the river will avoid the Masamune, they float right into the Murasame and get split in two. Murasame was a swordsmith like Masamune long ago in Japan. His swords were famed for the 'bloodlust' they supposedly created in those who wielded them. One day, Murasame challenged Masamune to a competition, to prove who was the better swordsmith. He placed his finest blade into a slow-moving stream; soon after, a leaf floated slowly into the edge of the blade, and was sliced, quietly and easily, into two pieces. Afterwards, Masamune placed his blade into the same stream. He soon proved that he was the better swordsmith, as leaves seemed to avoid his blade; a proof of its holy power. There are stories of a swordsmith named Senzo Muramasa who was supposedly an insane, but brilliant, student of Masamune, and that his swords would cause unnecessary bloodshed (Ratti, Oscar and Adele Westbrook, Secrets of the Samurai. Castle books, 1999). However, I find no mention of anyone by the name of Murasame. The "curse" of the sword was that it had brought misfortune to the ruling Tokugawa family. Also, some people who had the swords would erase part of the name of the swordsmith the Mura or the Masa and felt at ease at doing so to avoid any misfortune.
Nimbus Rod (FF10): Nimbus is Latin for cloud. It's also a word used today to mean a halo, or cloud-like radiance, or an aura. It is also a term used to describe a rain cloud, usually gray in color. This weapon has double overdrive.
Nirvana (FF10, FFTA): Nirvana (Yuna's ultimate weapon) is thought to be the final beatitude that transcends suffering, karma, and samsara and is sought especially in Buddhism through the extinction of desire and individual consciousness. Also, a place or state of oblivion to care, pain, or external reality. A goal hoped for but apparently unattainable. Also: "union with the universe and escape from the cycle of death and rebirth". This fits very nicely with Yuna's role in FF10. Buddhism makes it extremely clear that only deities can escape the cycle of reincarnation. This is how Buddhism defines a deity - some variants of Buddhism claim this is absolutely impossible and no deities can exist. This can be taken two ways. One way is that no mortal may ever reach Nirvana. The second is that Nirvana is not forever and that the soul will be reborn once it leaves Nirvana.
Nosada (FFTA): Comes from the 'Izumi no Kami Kanaseda', also called Nosada, the sword of Hijikata Toshizou, who founded a dojo of Kendo ('the way of the sword').
Obelisk (FF9): A type of short dagger. An obeliskis a four-sided tapering structure with a pyramidal top often used in Egyptian architecture. The most familiar example is the Washington Monument.
Oblige (FFTA): It says it's a "sword of the nobles"... From the phrase "noblesse oblige," perhaps?
Osafune: Short for Bizen Osafune, also called Osafune in FFT. Osafune was the largest and most prestigous sword-smithing schools
in ancient Japan. Formed by Mitsutada during the Kamakura period.
Peacemaker (FF7, FFTA): This is the name of a popular gun used in the old west.
Perseus Bow (Tactics): Named for the archer in Greek mythology. He's the one who killed Medusa (see Aegis Shield above).
Quicksilver (FF7): This is a real brand of guns. Quicksilver is also another name for mercury (probably the origin of the gun as well).
Ragnarok