Search gender: all male female タダテツ Japanese Boy Names Variations. 1 names found. gender: all male female Name: tadatetsu Katakana: タダテツ 0 Kanji: 忠徹 Meaning: 忠Sincerity. To serve with sincerity. Seriousness. To serve the state or sovereign with all one's heart. To work hard without bothering. 徹Let them through. I'll take it away. You can save your favorite names with NAZUKE PON > About Japanese Names > Search Japanese Names By Kanji > タダテツ Japanese Boy Names Variations.