Search gender: all male female イッカイ Japanese Names Variations. 1 names found. gender: all male female Name: ikkai Katakana: イッカイ 1 Kanji: 一懐 Meaning: 一One. The first. Kanji for the number 1 (one). To be the most superior. To begin, to put things together. 懐Nostalgic You can save your favorite names with NAZUKE PON > About Japanese Names > Search Japanese Names By Kanji > イッカイ Japanese Names Variations.