Search gender: all male female Hirohaku Boy Name Meaning, Kanji Variations. 1 names found. gender: all male female Name: hirohaku Katakana: ヒロハク 0 Kanji: 鴻博 Meaning: 鴻Whooper swan (Cygnus cygnus) 博Communicate widely. To know widely. Large. Wide. To take. gambling. You can save your favorite names with NAZUKE PON > About Japanese Names > Search For Japanese Names > Hirohaku Boy Name Meaning, Kanji Variations.