Search gender: all male female 洞 Japanese Boy Names Variations. 1 names found. gender: all male female Name: toya Katakana: トウヤ 0 Kanji: 洞也 Meaning: 洞Cave 也Affirmation. Words for exclamations, questions, and antonyms. You can save your favorite names with NAZUKE PON > About Japanese Names > Search Japanese Names By Kanji > 洞 Japanese Boy Names Variations.