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Thomas Hardy used Thomasina for the heroine of Return of the Native; her nn was Tamsin. This seems unlikely in the 21st century! So the choice would depend on whether one prefers Tommy or Tammy as a nn.

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I love Thomas, nn Tom, for a boy, so I wouldn't consider either Thomasin(a) or Tamsin, but if I had to, I'd go for Thomasin for the sake of Tommy. Tamsin had its brief moment of popularity in the 1970s, but not enough to matter: I just don't enjoy Tammy.