Save Gender Feminine Usage Japanese Scripts ルカ(Japanese Katakana) るか(Japanese Hiragana) 月歌, 流歌, 琉花, 瑠夏, etc.(Japanese Kanji) Pronounced Pron. ṘOO-KAH [key] Meaning & History From 琉 (ru) meaning "gem" and 花 (ka) meaning "flower". Other kanji combinations are possible.