Search gender: all male female Isahisa Boy Name Meaning, Kanji Variations. 1 names found. gender: all male female Name: isahisa Katakana: イサヒサ 0 Kanji: 功久 Meaning: 功Success. Credit. Results. Results of efforts. Work. Excellent work. Signs. ingenuity. Discipline. Skillfulness. Elaboration. 久For a long time. From long ago. From the past. You can save your favorite names with NAZUKE PON > About Japanese Names > Search For Japanese Names > Isahisa Boy Name Meaning, Kanji Variations.