Search gender: all male female Zaijiro Boy Name Meaning, Kanji Variations. 1 names found. gender: all male female Name: zaijiro Katakana: ザイジロウ 4 Kanji: 在二郎 Meaning: 在Exist 二Two, The second. Kanji character for the number 2 (two).The next. Again. Another. Different. 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 For Japanese Names > Zaijiro Boy Name Meaning, Kanji Variations.