Search gender: all male female セマ Japanese Boy Names Variations. 1 names found. gender: all male female Name: sema Katakana: セマ 0 Kanji: 勢馬 Meaning: 勢Momentum 馬Horse. A metaphor for something big. A metaphor for something lowly. You can save your favorite names with NAZUKE PON > About Japanese Names > Search Japanese Names By Kanji > セマ Japanese Boy Names Variations.