From the Greek name Theodorus, meaning “gift of God.” And if you name your son Theodore, it’s pretty much guaranteed that he’ll be Theodor-able.
Theo, Ted, Teddy, Tad.
Famous people named Theodore:
Pope Theodore I; President Theodore Roosevelt; politician Theodore “Ted” Stevens; singer Theodore “Teddy” Pendergrass; author Theodore Seuss Geisel (a.k.a. Dr. Seuss).
On the show Leave It To Beaver, Theodore was Beaver Cleaver’s real name. So maybe we should file “The Beav” under possible Theodore nicknames.