I used to like it having read first the 'Malory Towers' stories by
Enid Blyton (though it was a school in it rather than a person) and then reading the Babysitter books by
Ann M.
Martin where there was a character called
Mallory.
However, I don't like it now.
My tastes have changed. That said, I see nothing wrong with it (depending on how bothered you are by meanings) and
Mallory Rose sounds pretty.