I really like it. I think it's a very warm and motherly name.
Of your list, I like:
Geraldine Augusta Geraldine Blythe Geraldine CoraGeraldine Florence Geraldine FrancesGeraldine Louisa Geraldine Margot - this is my combo for it
Geraldine Martha Geraldine Mary Geraldine Zinnia
I think
Geraldine Martha might be my favorite, and I might even like it better than my own combo!
Geraldine Cora is a close second, and
Geraldine Frances is third.