Leighton is probably the most name-y in sound, then Lexington, and Livingston not at all.
If I had to pick one it would be Lexington nn
Lexi for a girl or
Lex for a boy.
I’d prefer Livingston not be used as a first name at all for anyone.
Leighton I’ve seen used as masculine and Lexington as feminine and I don’t mind I guess.
No combinations come to mind at the moment.
**I love God far too much to be religious -
Jean Claude Koven**