Search gender: all male female 淨 Japanese Girl Names Variations. 1 names found. gender: all male female Name: joka Katakana: ジョウカ 0 Kanji: 淨禾 Meaning: 淨Clean 禾Rice. A general term for grains. You can save your favorite names with NAZUKE PON > About Japanese Names > Search Japanese Names By Kanji > 淨 Japanese Girl Names Variations.