My sister was almost a Thomasina.
However my uncle and Auntie had a baby a few months before and named him Thomas.
I don't like it on a personal level, but
Why is it any different to Georgina. I've never heard any negative comments about that.
If you like it go for it. Once people have their name 99.99% of the time they always grow into it. Eg I.didn't like my nephews name at first (Derry)
I love it now though. It really suits him down to a T.