I love
Wilhelmina and
Willa both, along with
Willow and Willodean (prn. like Willa-Dean). Willamina, though...well, I haven't thought about it before. I think it'd be easier to live with than
Wilhelmina (everyone would assume it was spelled Willamina anyway), and it's not at all aesthetically displeasing...yes, I like Willamina, too.
Honestly, I don't think you could go wrong with any of them.
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