Search gender: all male female Mukai Boy Name Meaning, Kanji Variations. 1 names found. gender: all male female Name: mukai Katakana: ムカイ 0 Kanji: 睦介 Meaning: 睦Good Friends 介Help. A person who helps. To be near, to accompany. to take care of. To intercede. To make friends with. to separate. to separate. to be firm. To protect tightly. Something that covers the outside to protect oneself. boundary. border. You can save your favorite names with NAZUKE PON > About Japanese Names > Search For Japanese Names > Mukai Boy Name Meaning, Kanji Variations.