Yeah, that would be hard for me to come up with.
Off the top of my head, no cheating:
Thomas.
Theodore / Ted
Thaddeus (earlier in this thread)
Tyler / Ty (a contractor working on our garden today!)
Tobias
Trini (does Spanish count?)
No girls’ names!
That’s it. I’m sure I’m going to be embarrassed for missing obvious ones. I’ll blame it on the Cabernet I had at dinner.