I like
Judith and
Judy. I even planned on making it a name for a future child, but I couldn't come up with a good middle name.
I don't know any Judiths and it doesn't feel like it will become popular very soon.
While I do like how she cut Holofernes' head off and saved everyone, I don't think that the parents would be overly religious and Protestants probably wouldn't get the Biblical connection at all.