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I had a student last year named Jefferson in honor of William Jefferson Clinton. It was a nice dual presidential name.
Darcy I could see on either a boy or a girl; it seems to fit with girls' naming trends but I also think about the Pride & Prejudice character who was usually referred to by his last name. Darby reads as more masculine to me for some reason.
Some other ideas: Roxana, Rubiana, Rodney, Darius, Dimitri, Debra
I have a friend who goes by Ren (nn for Tamaren which parents created with intended nn Tammy). It's suited her really well and I think the bird spelling makes it really cute and unique, too. My other reference for it is the older Disney channel show Even Stevens where the daughter is named Wren.
For Kaia, I think of the American Girl doll Kaya, who is Native American. I think it has a kind of pan-cultural appeal.
Finley seems like the most gender neurtral of the three. Personally, I like Wren best, but it depends what you're going for.
Chase, Drew, Luke, Reid
Claire, Lynn, Grace
I think Milan would be pronounced the same as the city from the Slavic. Milena, another Slavic name with a similar sound, also got a boost this year.
Here's my go:John
I really like it. I've been thinking of using it as a tribute for an Esther since it has similar sound and meaning.
The Obama's pronounce it Muh-LEE-uh for their daughter although I don't know if that would be as strong a reference in Australia
Laura: Laure, Lori, Lauren
Maria: Miriam, Marie, Mary, Marlene
Melissa: Melissandre, Mel,
Mina: Mimi, Minnie
Serena: Serene, Selene
Stella: Estelle, Stell
Victoria: Vicky, Tori, Victoriann
The first thing I noticed was both Bennett and Lucas are surnames featured in Pride and Prejudice. Actually, I get the English surname thing from Pierce and Grant too. Ever consider Austen as a name?
I really like Grady and Grant personally from the list you've given.
I've met a Larkin (5yo girl) and a Thor (13 yo boy). Briar was a male character in Tamora Pierce Circle of Magic books.
A friend of mine named her baby Guinevere last year with nn Vera to honor their favorite author, Vladimir Nabokov's wife.
I've definitely seen some hyper local multiplying of names. For example, taught a Hebrew school class in a liberal suburban area where 8/10 10 year old boys were named Jacob.