Rosemary, because of the herb and because I love both
Rose and
Mary separately.
-or-
Primrose, because there is something sweet about it. I believe that's partially due to an association with The Hunger Games character.
Not as fond of
Rosalind today, although she is lovely as well.
Also-- I think that
Primrose would be the most uncommon out of the three, with
Rosalind in second.