My husband got this on his mind and won’t let it go. Is it just too much? I can just hear the reactions now…“you must really love [name]Teddy[/name] [name]Roosevelt[/name]!”
I love TR and would definitely name a little boy [name]Theodore[/name] because of that, but even I think [name]Theodore[/name] [name]Rex[/name] is going a little too far. You will get exactly the reaction stated. What about [name]Theodore[/name] [name]Reginald[/name] or [name]Theodore[/name] [name]Kingsley[/name] to change it up a bit? You could also use [name]Nathaniel[/name] that has the same meaning, but in Hebrew.
I think its a nice name. The first nickname that came to mind was T-[name]Rex[/name]. I didn’t associate it with teddy [name]Roosevelt[/name].
My first was also T-[name]Rex[/name], which might be cute when you’re five but not when you’re a grown man. I think [name]Theodore[/name] is relatively common and while [name]Roosevelt[/name] is well known it’s not the only association with the name. If you used [name]Roosevelt[/name] then I’d think it would be a presidential nod, but that’s like saying if you use [name]George[/name] it must be for [name]Washington[/name] or [name]Bush[/name]. I think it’s just a underused classic. I like both [name]Theodore[/name] and [name]Rex[/name], but together I’m not sold on it - I think I can let go of the T-[name]Rex[/name] bit!
In addition to the automatic T-rex, the ore-rex sounds smushy to me. Sounds like “Theodorex.” [name]Rex[/name] [name]Theodore[/name] is pretty cool though 
My first thought was [name]Teddy[/name] Ruxbin, the child’s toy from the 80s, quickly followed by T-[name]Rex[/name]. [name]How[/name] about [name]Theodore[/name] [name]Henry[/name]?
I don’t think it works, for all the reasons mentioned above.