Search gender: all male female Unamasa Boy Name Meaning, Kanji Variations. 1 names found. gender: all male female Name: unamasa Katakana: ウナマサ 0 Kanji: 海若 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. 若Young. A little. Comparable. An auxiliary character used to create adjectives. A particle of assumption. You can save your favorite names with NAZUKE PON > About Japanese Names > Search For Japanese Names > Unamasa Boy Name Meaning, Kanji Variations.