Search gender: all male female Ninko Girl Name Meaning, Kanji Variations. 1 names found. gender: all male female Name: ninko Katakana: ニンコ 0 Kanji: 任子 Meaning: 任To leave to others. A role or matter to be fulfilled. Guarantee. To assign to an official position. To give a role to. To let do as one pleases. 子Children You can save your favorite names with NAZUKE PON > About Japanese Names > Search For Japanese Names > Ninko Girl Name Meaning, Kanji Variations.