Search gender: all male female ロタロウ Japanese Boy Names Variations. 1 names found. gender: all male female Name: rotaro Katakana: ロタロウ 0 Kanji: 呂太郎 Meaning: 呂Yin tone in Gagaku music, etc. 太Abundantly large. Large in circumference. Thick. Flabby. Very. A word used to refer to a person of high rank or status. 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 > ロタロウ Japanese Boy Names Variations.