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I would always give the full version of any name at all, I think. Unless it's a name that has iceberged off the original and acquired independent existence - I wouldn't name a child Elizabeth if I was going to call her Bethan, but if I was going to call her Bess, then I would. So, I'd use Theodore rather than Theo. More history, more possibilities. And I think Theodore goes well enough with the names you've listed!