Search gender: all male female イワゴロウ Japanese Boy Names Variations. 1 names found. gender: all male female Name: iwagoro Katakana: イワゴロウ 0 Kanji: 岩五郎 Meaning: 岩Rock 五Five, The fifth. Kanji to represent the number 5 (five). One more number than four. 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 > イワゴロウ Japanese Boy Names Variations.