Search gender: all male female イチトシ Japanese Boy Names Variations. 1 names found. gender: all male female Name: ichitoshi Katakana: イチトシ 0 Kanji: 壱勇 Meaning: 壱One. The first of the natural numbers. First. The most excellent. Only that. Make it one. 勇Brave. Strong. Vigorous. Spirited. Decisive. Innocent. Exuberant. Soldier. Very strong soldier. You can save your favorite names with NAZUKE PON > About Japanese Names > Search Japanese Names By Kanji > イチトシ Japanese Boy Names Variations.