I'm also not a big fan of Theodore, and I love Theo. It is one of my top three boy names.
I would personally use Theo as a stand alone name - I'm generally a big supporter of "name the kid what you're going to call them." Unless it is a childhood cutesy nickname sort of thing you think they'll grow out of as they age (example: nn Nellie for Eleanor, probably won't be used as an adult).
That said, we know two baby boys called Theo, and both their full names are Theodore.
Re: Theo
4/25/14 12:41am
My furchildren, Dorothy and Johnny