This spelling with the umlaut, making it "no-elle," is 100% feminine. And beautiful. (Especially if she's born on Christmas.) Noel pronounced "nole" is of course masculine. I very much dislike spelling it "Noelle." Use the umlaut to clarify. (But even then, on a girl, that's not entirely necessary. In "Nick and Noel" the cat's name lacks the diacritical, yet my 6-year-old self had no trouble understanding.)
I completely disagree with this being listed as a masculine name. Noel without the umlaut would be the male name pronounced as "knoll," but "no-el" sounds feminine to me. I've never really liked using "Noelle" for girls; the umlaut separates the vowel sounds into two syllables, so it's just unnecessary to add extra letters to feminize the name. I love Noel (with the dots!) for girls.
Noel pronounced "nole" is of course masculine.
I very much dislike spelling it "Noelle." Use the umlaut to clarify. (But even then, on a girl, that's not entirely necessary. In "Nick and Noel" the cat's name lacks the diacritical, yet my 6-year-old self had no trouble understanding.)