Search gender: all male female 貝 Japanese Boy Names Variations. 22 names found. gender: all male female Name: kaichi Katakana: カイイチ 0 Kanji: 貝一 Meaning: 貝Shells. 一One. The first. Kanji for the number 1 (one). To be the most superior. To begin, to put things together. Name: kai Katakana: カイ 0 Kanji: 貝 Meaning: 貝Shells. You can save your favorite names with prev12 NAZUKE PON > About Japanese Names > Search Japanese Names By Kanji > 貝 Japanese Boy Names Variations.