I like it. I wouldn't mind being a
Marcia at any age. I'd rather be
Marcia than
Marsha. Although I like
Marsha, it reminds me more of the
Brady Bunch, and it also reminds me more of
Marshall than it does of
Marcus.
Marcia evokes
Marcus well... better than
Marcella IMO. Ideally I'd want to pronounce it with three syllables, MAR-see-a. But I doubt I actually would, since that'd be pretty impractical.