Search gender: all male female Koijiro Name Meaning, Kanji Variations. 1 names found. gender: all male female Name: koijiro Katakana: コイジロウ 0 Kanji: 鯉治郎 Meaning: 鯉Sea bream 治Govern. Manage. Quell. Judge. Correct. To adjust. To cure illness or injury. To treat. To compare. To help. To flourish. 郎Male. Men. Young men. A word that refers broadly to boys. A retainer. You can save your favorite names with NAZUKE PON > About Japanese Names > Search For Japanese Names > Koijiro Name Meaning, Kanji Variations.