Search gender: all male female Mitsui Girl Name Meaning, Kanji Variations. 1 names found. gender: all male female Name: mitsui Katakana: ミツイ 0 Kanji: 三津衣 Meaning: 三Three. The third. Kanji to represent the number 3 (three).Again. Again and again. Many times. 津Port 衣A garment. Something to wear. A jacket. Something to cover the outside. You can save your favorite names with NAZUKE PON > About Japanese Names > Search For Japanese Names > Mitsui Girl Name Meaning, Kanji Variations.