Save Type Surname Usage Japanese (Rare) Scripts 紅蛇(Japanese Kanji) こうじゃ(Japanese Hiragana) Pronounced Pron. /ko̞ː.ʑä/ [key·simplify] Other Forms FormsKoja Meaning & History From Japanese 紅 (kō) meaning "crimson; vivid red" and 蛇 (ja) meaning "snake; serpent".