I like it.
My first thought actually was
Mallory of the BSC, but I like that character :p Not nearly as much as
Claudia and
Mary Ann, though! Anyway...
Mallory is sweet, almost girl-next-door. The meaning is off-putting, but that depends on how you feel about meanings. It also reminds me of the 80s for some reason, but that's not a negative for me.
I also think it's similar in feel to
Brittany (ughh),
Courtney etc, which would make
Mallory familiar without being common.