Search gender: all male female Seishimaru Boy Name Meaning, Kanji Variations. 1 names found. gender: all male female Name: seishimaru Katakana: セイシマル 0 Kanji: 勢至丸 Meaning: 勢Momentum 至Reach. There's nothing better. The day on which the sun reached the pole. 丸Round. No corners. Gentle. A dumpling. A dumpling made from fish or other ingredients. Abbreviation of pill. You can save your favorite names with NAZUKE PON > About Japanese Names > Search For Japanese Names > Seishimaru Boy Name Meaning, Kanji Variations.