Search gender: all male female Isshin Girl Name Meaning, Kanji Variations. 1 names found. gender: all male female Name: isshin Katakana: イッシン 0 Kanji: 一心 Meaning: 一One. The first. Kanji for the number 1 (one). To be the most superior. To begin, to put things together. 心Mind. Spirit. Feelings. Thoughts. Heart. Chest. Center. The center of things. Important things. The point. You can save your favorite names with NAZUKE PON > About Japanese Names > Search For Japanese Names > Isshin Girl Name Meaning, Kanji Variations.