Search gender: all male female Isshu Girl Name Meaning, Kanji Variations. 1 names found. gender: all male female Name: isshu Katakana: イッシュ 0 Kanji: 一朱 Meaning: 一One. The first. Kanji for the number 1 (one). To be the most superior. To begin, to put things together. 朱Red. Red with yellowish tinge. Red pigment. Red ink. You can save your favorite names with NAZUKE PON > About Japanese Names > Search For Japanese Names > Isshu Girl Name Meaning, Kanji Variations.