Thaddeus (Latin: Thaddaeus, Ancient Greek: Θαδδαῖος, romanized: Thaddaĩos, from Imperial Aramaic: תדי, romanized: Ṯaday) is a masculine given name. As of the 1990 Census, Thaddeus was the 611th most popular male name in the United States, while Thad, its diminutive version, was the 846th. Alternate forms. Taco – Dutch. Tadeu (ind. Tade) – Albanian. Թադէոս ("Tadeos"), Թադևոս ("Tadevos"), Թաթոս ("Tatos") – Armenian. Tadija – Croatian. Tadeáš – Czech. Thaddée – French. თადეოზი (tadeozi) Georgian. Thaddäus – German. Tádé – Hungarian. Tadáias (Biblical), Tadhg (given name) – Irish.
https://en.wikipedia.org/wiki/Thaddeus