Search gender: all male female ユイロウ Japanese Boy Names Variations. 1 names found. gender: all male female Name: yuiro Katakana: ユイロウ 0 Kanji: 唯郎 Meaning: 唯That's it. Just one. Only. A word expressing limitation or emphasis. Reply. A reply of acceptance that is answered immediately. 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 Japanese Names By Kanji > ユイロウ Japanese Boy Names Variations.