Search gender: all male female リョクロウ Japanese Boy Names Variations. 1 names found. gender: all male female Name: ryokuro Katakana: リョクロウ 0 Kanji: 緑郎 Meaning: 緑Green. Intermediate color between blue and yellow. The color of trees and grasses. It also refers to the plants and trees themselves. Black hair with a glossy sheen. 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 > リョクロウ Japanese Boy Names Variations.