I don't like many obviously feminised male names - they usually reek of 'we wanted a boy', but I do love
Thomasina and I'd use it.
Jamesina, on the other hand, looks ridiculously contrived - maybe because the 'es' ending of
James always looks like a plural to me. Anyway, I don't like
Jamesina and I'd be amazed to hear it on an actual person
http://www.behindthename.com/pnl/167578