Search gender: all male female 勢 Japanese Names Variations. 161 names found. gender: all male female Name: issei Katakana: イッセイ 0 Kanji: 一勢 Meaning: 一One. The first. Kanji for the number 1 (one). To be the most superior. To begin, to put things together. 勢Momentum You can save your favorite names with prev1…56789 NAZUKE PON > About Japanese Names > Search Japanese Names By Kanji > 勢 Japanese Names Variations.