I'd have to say that I find Jamison to be a more appealing alternative for a girl than Jamesine or Jamesina because to me they're both just incredibly ugly.
I agree with this. People don't know hordes of men named
Jamison, the way they would know lots of RL men named
Brian or
Thomas. And with
Madison,
Addison and
Emerson all well established ... I think people would get used to
Jamison. I don't like it, not one bit, but I think I hate
Jamesina more.