Search gender: all male female Ninichi Boy Name Meaning, Kanji Variations. 1 names found. gender: all male female Name: ninichi Katakana: ニンイチ 0 Kanji: 忍一 Meaning: 忍Endure. To keep out of sight. To keep people from knowing. Ninja or ninjutsu. To have in this way. Cruelty. 一One. The first. Kanji for the number 1 (one). To be the most superior. To begin, to put things together. You can save your favorite names with NAZUKE PON > About Japanese Names > Search For Japanese Names > Ninichi Boy Name Meaning, Kanji Variations.