Search gender: all male female イチウ Japanese Boy Names Variations. 1 names found. gender: all male female Name: ichiu Katakana: イチウ 0 Kanji: 一宇 Meaning: 一One. The first. Kanji for the number 1 (one). To be the most superior. To begin, to put things together. 宇Eaves. Roof. A house covered with a large roof. A world covered with a big sky. Infinite space. Heaven. The sky. Spirit. A broad and generous heart. You can save your favorite names with NAZUKE PON > About Japanese Names > Search Japanese Names By Kanji > イチウ Japanese Boy Names Variations.