Search gender: all male female Tadaju Name Meaning, Kanji Variations. 1 names found. gender: all male female Name: tadaju Katakana: タダジュ 0 Kanji: 忠壽 Meaning: 忠Sincerity. To serve with sincerity. Seriousness. To serve the state or sovereign with all one's heart. To work hard without bothering. 壽Long life. Life. Age. Celebration. Celebration of long life. You can save your favorite names with NAZUKE PON > About Japanese Names > Search For Japanese Names > Tadaju Name Meaning, Kanji Variations.