Search gender: all male female コユ Japanese Boy Names Variations. 1 names found. gender: all male female Name: koyu Katakana: コユ 0 Kanji: 己有 Meaning: 己Myself. The person. 有To exist. To have. To keep. To hold on to. Also. In addition to. Wealth. Property. You can save your favorite names with NAZUKE PON > About Japanese Names > Search Japanese Names By Kanji > コユ Japanese Boy Names Variations.