Thaddeus, a distinguished, long-neglected name, has several areas of appeal: a solid New Testament legacy, a nice antique feel, and the choice of several more modern nicknames and international variations. In the United States, it has started gaining momentum: it has risen steadily since 2010, currently at Number 641.
In the Bible, Thaddeus was one of the original Twelve Apostles.
Thaddeus has made quite a few screen appearances, ranging from Spongebob Squarepants to Police Academy to Get Smart (it was the given name of the Chief) to Harry Potter. As Tadzio—the Slavic version—he played a leading role in Thomas Mann's Death in Venice.
In real life, Thaddeus Stevens was a dominant political figure during the Civil War. Mia Farrow has a son named Thaddeus.