Hmm.
Mara. I can't think of any dodgy nns.
Mara Margaret is too many m's.
Mara Joan feels like it needs another syllable.
Mara Johanna is too rhymey (both ending in 'ah' sound).
Some suggestions?
Mara Eleanor?
Mara Faith?
Mara Emily?
Mara Edith?
Mara Christine?
Mara Felicity?
Out of those id probably say
Mara Emily is the nicest.