Search gender: all male female Itsunari Boy Name Meaning, Kanji Variations. 1 names found. gender: all male female Name: itsunari Katakana: イツナリ 0 Kanji: 五成 Meaning: 五Five, The fifth. Kanji to represent the number 5 (five). One more number than four. 成To finish. Grow. To raise up. Accomplish. To be fruitful. to change into Good. splendid. large. well-organized. You can save your favorite names with NAZUKE PON > About Japanese Names > Search For Japanese Names > Itsunari Boy Name Meaning, Kanji Variations.