吉光 [yoshimitsu] in Japanese. It means 'auspicious light', and is named after Awataguchi Yoshimitsu, who is considered one of the three greatest swordsmiths in Japanese history, alongside Masamune and Go Yoshihiro. He was an expert in crafting tanto and short katana, and is famous for devoting production to mainly these kinds of blades.
A Realm Reborn

Stats: PDMG 44, MDMG 33, ATK 36.4, Delay 2.5, DPS 14.7, DEX +27, VIT +30, ACC +23, Crit rate +33
Equip Level: 50, Equip On: ROG, NIN
Item Level: 80, Rarity: Purple
Buy: 49,896 gil (sell: -)
Shop: Calamity Salvager
Obtain: A Relic Reborn (Yoshimitsu)
Use: Yoshimitsu Zenith
Type: Rogue's Arm, Stack: 1, Unique: Yes, Untradeable: Yes, Binding: Yes
Dye: No, FC Crest: No, Materia Slots: No, Convert: No, Desynthesis: No
Glamour: Smithing, Repair: 80 gil / Grade 5, BSM40
Description: One of the fabled relic weapons
Record Keeper

Yoshimitsu (XIV)
Stats: ATK +78, ACC 95 (lv1), ? (lv5), ? (lv10), ? (lv15), ? (lv20), ? (lv25), ATK +125, ACC 95 (lv30)
Max Level: lv20 (initial), lv25 (first evolve), lv30 (second evolve)
Type: Dagger, Rarity: ★★★★★
Other: enables use of the Dancing Edge Soul Break when equipped by Thancred
Category: Equipment