Search gender: all male female Umimasa Boy Name Meaning, Kanji Variations. 1 names found. gender: all male female Name: umimasa Katakana: ウミマサ 0 Kanji: 海誠 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. 誠True. A heart without lies and falsehoods. Sincerity. Truly. You can save your favorite names with NAZUKE PON > About Japanese Names > Search For Japanese Names > Umimasa Boy Name Meaning, Kanji Variations.