Search gender: all male female トヨイチロウ Japanese Boy Names Variations. 1 names found. gender: all male female Name: toyoichiro Katakana: トヨイチロウ 0 Kanji: 豊一郎 Meaning: 豊Abundance. Large in quantity. Large. full. To make crops grow well. 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 > トヨイチロウ Japanese Boy Names Variations.