Search gender: all male female レイチロウ Japanese Boy Names Variations. 1 names found. gender: all male female Name: reichiro Katakana: レイチロウ 0 Kanji: 怜一郎 Meaning: 怜Smart. clever. To pity. 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 > レイチロウ Japanese Boy Names Variations.