Search gender: all male female Jinnai Boy Name Meaning, Kanji Variations. 2 names found. gender: all male female Name: jinnai Katakana: ジンナイ 0 Kanji: 甚内 Meaning: 甚Very much 内Inside. Name: jinnai Katakana: ジンナイ 0 Kanji: 陣内 Meaning: 陣Formation. Preparation for war. Deployment of troops. Battlefield. Battle. For a short while. 内Inside. You can save your favorite names with NAZUKE PON > About Japanese Names > Search For Japanese Names > Jinnai Boy Name Meaning, Kanji Variations.