Search gender: all male female オトイチロウ Japanese Boy Names Variations. 1 names found. gender: all male female Name: otoichiro Katakana: オトイチロウ 0 Kanji: 乙一郎 Meaning: 乙Second. The second of the ten signs of the Chinese zodiac for measuring time. Young. Cute. 一One. The first. Kanji for the number 1 (one). To be the most superior. To begin, to put things together. 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 > オトイチロウ Japanese Boy Names Variations.