Both Spencer and Leighton strike me as trendy... perhaps inspired by Pretty Little Liars and the Gossip Girl starlet? Lucia is pretty, I just never know how to pronounce it. Lucy-a, Loosha, or Loo-see-a. I would steer away from anything associated with YA novels or teen television dramas or films.
Just find something that's unique to you and meaningful, beyond its inspiration.
You're right, they do seem trendy and very young adult from the shows. And if I were to name my daughter Lucia, I would want it pronounced Loosha:) but I know she would end up being called many different versions. Thanks, you helped me so much you have no idea!
You helped me fall in live with some beautiful and elegant names, thanks so much!