Search gender: all male female Iwai Name Meaning, Kanji Variations. 2 names found. gender: all male female Name: iwai Katakana: イワイ 0 Kanji: 祝衣 Meaning: 祝Celebration 衣A garment. Something to wear. A jacket. Something to cover the outside. Name: iwai Katakana: イワイ 0 Kanji: 祝 Meaning: 祝Celebration You can save your favorite names with NAZUKE PON > About Japanese Names > Search For Japanese Names > Iwai Name Meaning, Kanji Variations.