Search gender: all male female 庚 Japanese Names Variations. 21 names found. gender: all male female Name: koichi Katakana: コウイチ 0 Kanji: 庚一 Meaning: 庚Seventh 一One. The first. Kanji for the number 1 (one). To be the most superior. To begin, to put things together. You can save your favorite names with prev12 NAZUKE PON > About Japanese Names > Search Japanese Names By Kanji > 庚 Japanese Names Variations.