Maddy was a nickname for Maude (before becoming a nickname for "Madison" itself) but that would make it a rare since it'd be from the mother's side. Random inte

Maddy was a nickname for Maude (before becoming a nickname for "Madison" itself) but that would make it a rare since it'd be from the mother's side. Random internet sources claim it's more likely to be a variation of "Matthew's Son" but none seemed particularly certain.