I reckon if you love Theodore go with it, you will find yourself wishing you had done it. The names that i like the best out of my kidlets are the ones that are'nt well used, Gabe offically Gabriel just in case he gets knighted or something Sir Gabe does'nt cut it??? and bubs is Poppy, we love it to bits and never had any doubts. If she was a boy we were looking for names not so common like Theo, we had Ned, Jed,Josiah, Issiah on the list just love the old names. Tegan was going to be Lucinda Lousie and would have got Luci Lou, but we could'nt do it and she often says she wished we had, "not boring like Tegan". Sophie is cute but there are so many of them...ouch!!!!
Good luck, we waited until they were here JIC they did'nt look like the name we had picked, which happened twice.