Search gender: all male female Kosui Girl Name Meaning, Kanji Variations. 2 names found. gender: all male female Name: kosui Katakana: コスイ 0 Kanji: 小翠 Meaning: 小Small. Little. Small in number or quantity. Trivial. Insignificant. Unimportant. Young person. Underestimate the ability. To treat lightly. A word used to humble oneself. 翠Kingfisher (bird's name). Jade. Green. Name: kosui Katakana: コウスイ 0 Kanji: 昂翠 Meaning: 昂Ascent. To rise high. The sun rises. Emotion is overwhelming. 翠Kingfisher (bird's name). Jade. Green. You can save your favorite names with NAZUKE PON > About Japanese Names > Search For Japanese Names > Kosui Girl Name Meaning, Kanji Variations.