It's very nickname-y to me, though I don't really love
Marlena or
Marlene. Oddly enough, I think it could work as a nn for
Margaret.
Marlee is slightly more appealing to me, maybe because of
Marlee Matlin. But also because
Marley is such a surname to me, and makes me think of
Bob Marley (not bad, but only if you're a BIG fan of his or something).
~
Heather~