Search gender: all male female Niji Girl Name Meaning, Kanji Variations. 2 names found. gender: all male female Name: niji Katakana: ニジ 0 Kanji: にじ Meaning: に じ Name: niji Katakana: ニジ 0 Kanji: 虹 Meaning: 虹Rainbow. You can save your favorite names with NAZUKE PON > About Japanese Names > Search For Japanese Names > Niji Girl Name Meaning, Kanji Variations.