A shortened form of the name Thaddeus, typically used as a first name for a person.
From the proper name Thaddeus, which comes from Aramaic 'Taddai' meaning 'praised' or 'courageous.' Thad is an informal English nickname that developed in American English.
Thad is interesting because it's one of those nicknames that became almost a standalone name—unlike 'Bob' (from Robert) or 'Bill' (from William), 'Thad' doesn't have an obvious logical connection to Thaddeus unless you know the history!
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