I love Blake for a boy or a girl! Our second son was almost David Blake (we chose a different name because we loved it just as much) and Blake was on the short list for a girl's name for this baby. It ranked about #5 for us, so it wasn't our pick, but out of your 4 names, I love it
We also discussed Gwyn or Quinn for a girl (and two other names that are three syllables each) but we settled on a two syllable name.