Search gender: all male female Nijio Girl Name Meaning, Kanji Variations. 1 names found. gender: all male female Name: nijio Katakana: ニジオ 0 Kanji: 虹緒 Meaning: 虹Rainbow. 緒The beginning of things. Connection. A thought caused by a thing. You can save your favorite names with NAZUKE PON > About Japanese Names > Search For Japanese Names > Nijio Girl Name Meaning, Kanji Variations.