Search gender: all male female Kainaru Boy Name Meaning, Kanji Variations. 1 names found. gender: all male female Name: kainaru Katakana: カイナル 0 Kanji: 海成 Meaning: 海Sea. Wide and large. A place where many people and things gather. A large lake or pond. A large lake or pond. A frontier. The end of the earth. 成To finish. Grow. To raise up. Accomplish. To be fruitful. to change into Good. splendid. large. well-organized. You can save your favorite names with NAZUKE PON > About Japanese Names > Search For Japanese Names > Kainaru Boy Name Meaning, Kanji Variations.