I like
Marceline. I think it sounds something like...elegant, spirited, sweet.
I like
Marcella, too, but right now it's mostly just making me think of a bitter 1960s housewife.
Marcella maybe also seems louder/brighter to me while
Marceline seems softer/subtler.
I feel like
Ellie is too much of a stretch, and I like
Ella but only as a NN for
Marcella. I prefer
Marceline on its own, but I think I'd pick
Celine over
Marcie.
In order of preference:
1.
Marceline2.
Marguerite3.
Marcella4.
Marcelina