Thaddeus (Greek Θαδδαῖος, Thaddaios, from Aramaic תדי, Taddai / Aday) is a male given name. It means a heart, or courageous heart .
As of the 1990 Census, 'Thaddeus' was the 611th most popular male name in the United States and 'Thad' was the 846th most popular.
Read more about Thaddeus: Alternate Forms, Saints, People