It's true, I had thought of
Jamesina, but I'm still not sold on it. I suppose it is because it's so very unusual, and I'm not sure if it would properly honour the original James...wouldn't it come across as something like "We named the baby after you! Well...sort of."?
Although, I do like
Jamesina. I do love things that are a little different! I definitely will think on it, never fear!