Search gender: all male female Kotosuke Name Meaning, Kanji Variations. 1 names found. gender: all male female Name: kotosuke Katakana: コトスケ 0 Kanji: 琴助 Meaning: 琴Koto. General term for all stringed instruments. A musical instrument that has been familiar to Japanese people since ancient times. 助Help. To lend help. To get out of a dangerous situation. To save. You can save your favorite names with NAZUKE PON > About Japanese Names > Search For Japanese Names > Kotosuke Name Meaning, Kanji Variations.