My favourites are
Rosa, "plain
Rose" (but as a fn, it's so tired as a mn, even if it is a family name) and
Rosalind.
Rosalie is a runner up :)
Rose isn't tired and overused, it's nice to see as a first name. Most filler mns are. I love to meet girls with
Marie,
Grace,
Rose,
May,
Anne and
Jane as first names. They're sweet and well known, but not so common to see. And the fact that it's a family name is nice too.