Search gender: all male female イツオ Japanese Boy Names Variations. 21 names found. gender: all male female Name: itsuo Katakana: イツオ 0 Kanji: 一雄 Meaning: 一One. The first. Kanji for the number 1 (one). To be the most superior. To begin, to put things together. 雄Male. The male of an animal. Brave. An excellent person. Large in scale. You can save your favorite names with prev12 NAZUKE PON > About Japanese Names > Search Japanese Names By Kanji > イツオ Japanese Boy Names Variations.