Search gender: all male female Kaiu Boy Name Meaning, Kanji Variations. 1 names found. gender: all male female Name: kaiu Katakana: カイウ 0 Kanji: 海雨 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. 雨Rain. Something that pours down like rain. You can save your favorite names with NAZUKE PON > About Japanese Names > Search For Japanese Names > Kaiu Boy Name Meaning, Kanji Variations.