It doesn't appeal to me, although I can't say why. I like Sara and I like Maya and I like Mia. But Mara doesn't do it for me.
But please reconsider dropping Nina because your neighbor picked it. I adore that name. There are plenty of people in the world with the same name. Your neighbors don't own it. It is one of my favorite names and it makes me sad that someone who was going to use it decided not to.