Search gender: all male female Riyu Boy Name Meaning, Kanji Variations. 21 names found. gender: all male female Name: riyu Katakana: リユ 0 Kanji: 理友 Meaning: 理The way of things. The path or reason of things. Pattern. To set in order. Natural science. 友Friend You can save your favorite names with prev12 NAZUKE PON > About Japanese Names > Search For Japanese Names > Riyu Boy Name Meaning, Kanji Variations.