Search gender: all male female Esu Boy Name Meaning, Kanji Variations. 1 names found. gender: all male female Name: esu Katakana: エス 0 Kanji: 瑛主 Meaning: 瑛A beautiful, transparent gem. Crystals. Gemstone light. Beautiful transparent gem. 主A master. A chief. The head of a house, store, etc. A person who invites a lord or a guest. To play a central role. The main thing. The one who is first. You can save your favorite names with NAZUKE PON > About Japanese Names > Search For Japanese Names > Esu Boy Name Meaning, Kanji Variations.