Meaning & Story
Of Aramaic origin, Thaddaeus is a form of an ancient name possibly meaning "heart" or "courageous heart" — borne by one of the twelve apostles and associated with steadfast loyalty.
Thaddeus is a magnificent mouthful of a name for a pet who absolutely fills the room. It's old-fashioned in the best possible way — the kind of name that was waiting patiently for decades to come back around, and has now arrived on the backs of various distinguished dogs and cats. It carries gravitas without stuffiness, and the nicknames practically write themselves: Thad, Taddy, Theo. A dog named Thaddeus is probably a large, gentle breed who takes his responsibilities very seriously and is deeply beloved by everyone he meets.