It's been a long time, but here are the character weapons of Xenogears.
Rods:
Magical Rod - マジカルロッド - MAJIKARURODDO - Magical Rod
Arcane Rod - シグナルロッド - SHIGUNARURODDO - Signal Rod
Hot Rod - ラジカルロッド - RAJIKARURODDO - Radical Rod
Or "Logical Rod." In either case, the katakana are nearly identical to those for the Magical Rod, above.
Lunar Rod - ムーンロッド - MU-NRODDO - Moon Rod
Marshal Rod - マーシャルロッド - MA-SHARURODDO - Martial Rod
Thunder Rod - サンダーロッド - SANDA-RODDO - Thunder Rod
Stone Rod - アースロッド - A-SURODDO - Earth Rod
Flare Rod - フレアロッド - FUREARODDO - Flare Rod
Ice Rod - アイスロッド - AISURODDO - Ice Rod
Queen's Rod - クィーンロッド - KUI-NRODDO - Queen Rod
Dynamite Rod - ダイナマイロッド - DAINAMAITORODDO - Dynamite Rod
Dark Rod - ダークロッド - DA-KURODDO - Dark Rod
Psycho Rod - コテンパンロッド - KOTENPANRODDO - Bruising Rod
Literally "black-and-blue rod," but this name makes it a bit more clear.
Whips:
Leather Whip - レザーウイップ - REZA-UIPPU - Leather Whip
Iron Whip - アイアンウイップ - AIANUIPPU - Iron Whip
WhippaSnappa - スナッパー - SUNAPPA- - Snapper
Cobra Cracka - コブラ - KOBURA - Cobra
Serpent Sting - サーペント - SA-PENTO - Serpent
Black Snake - ブラックスネーク - BURAKKUSUNE-KU - Blacksnake
Silver Blood - シルバーブラッド - SHIRUBA-BURADDO - Silverblood
Whip-Lasher - ガリアンウイップ - GARIANUIPPU - Gallian Whip
Desert Worm - デザートウォーム - DEZA-TOUO-MU - Desert Worm
Sonic Wave - サウンドウェイブ - SAUNDOUEIBU - Soundwave
Wonder Whip - バスターウイップ - BASUTA-UIPPU - Buster Whip
Thor's Thunda - ライジン - RAIJIN - Swift Thunder
Or "thunder god." Without kanji, it's pretty ambiguous, but "swift thunder" makes more sense for a whip, IMHO.
Death Adder - デスウイップ - DESUUIPPU - Death Whip
Guns:
B&J M10 Gun - B&JM10 - B&JM10 - B&JM10
B&J M686 Gun - B&JM686 - B&JM686 - M&JM686
Matchlock - 古式銃 - koshikijuu - Old-Style Gun
Godfather - ゴッドファーザー - GODDOFA-ZA- - Godfather
Ether Gun Right - エーテルガン右 - E-TERUGAN migi - Ether Gun Right
Ether Gun Left - エーテルガン左 - E-TERUGAN hidari - Ether Gun Left
Shotgun - ビッグガン - BIGGUGAN - Big Gun
Ammunition:
I used "bullets" rather than "bullet" as the translation for 弾 here because you buy them in packs.
B&J M10A Ammo - B&JMA弾 - B&JMA dan - B&JMA Bullets
B&J M10S Ammo - B&JMS弾 - B&JMS dan - B&JMA Bullets
B&J M10X Ammo - B&JMX弾 - B&JMX dan - B&JMA Bullets
B&J M686A Ammo - B&JM6A弾 - B&JM6A dan - B&JM6A Bullets
B&J M686S Ammo - B&JM6S弾 - B&JM6S dan - B&JM6S Bullets
B&J M686X Ammo - B&JM6X弾 - B&JM6X dan - B&JM6X Bullets
MatAero Ammo - E001弾 - E001 dan - E001 Bullets
MatTerra Ammo - E002弾 - E002 dan - E002 Bullets
MatPyro Ammo - E003弾 - E003 dan - E003 Bullets
MatHydro Ammo - E004弾 - E004 dan - E004 Bullets
The names of these ammo types were likely changed to make their elemental attributes more clear.
Godson Ammo - GOD弾 - GOD dan - GOD Bullets
EthWind Ammo - 風のエーテル弾 - kaze no E-TERU dan - Wind Ether Bullets
EthEarth Ammo - 地のエーテル弾 - chi no E-TERU dan - Earth Ether Bullets
EthFire Ammo - 火のエーテル弾 - hi no E-TERU dan - Fire Ether Bullets
EthWater Ammo - 水のエーテル弾 - mizu no E-TERU dan - Water Ether Bullets
Shot G50 Ammo - SS010弾 - SS010 dan - SS010 Bullets
Shot G60 Ammo - SS020弾 - SS020 dan - SS020 Bullets
Shot G70 Ammo - SS030弾 - SS030 dan - SS030 Bullets
Shot G80 Ammo - SS040弾 - SS040 dan - SS040 Bullets
Swords:
Since these are all katanas, I chose to leave their names untranslated.
Sengoku Sword - 戦国刀 - sengoku katana -
Sengoku Katana
Yamame Sword - 山女 - yamame - Yamame
Literally "mountain woman," but could also refer to
a type of fish.
Yamato Sword - 大和魂 - yamatodamashii -
Yamato-Damashii Mumyo Sword - 無命 - mumyou - Mumyou
The given kanji have a lot of possible interpretations, but the one I think fits best is "lifeless."