I really like it. It's quite newly-popular in the
UK but I think it's more of an underused classic. I've never even thought of
Marty being a nn for it, so I don't think it's inevitable.
I like
Martha and
Susan and
Martha and
Elizabeth "
Betsy", I also like it with
Eliza.
From your combos I like
Martha Emily,
Martha Harriet and
Martha Josephine. My favourite combo with it is
Martha Lucy (although I don't actually like the name
Lucy, I think it goes well here).