Search gender: all male female Koyoru Girl Name Meaning, Kanji Variations. 1 names found. gender: all male female Name: koyoru Katakana: コヨル 0 Kanji: 子夜 Meaning: 子Children 夜Night. The time between sunset and sunrise. The dark period when the sun is setting. A metaphor for something quiet and serene. You can save your favorite names with NAZUKE PON > About Japanese Names > Search For Japanese Names > Koyoru Girl Name Meaning, Kanji Variations.