A nn as a given name is ok. My grandpas band was
John nn
Jack and I have a cousin,
Jack who was named after him.
I like
Luke it's not too popular. I feel like
Luca is more popular.
It stands out on its own
Luke AndrewNope
Lucy isn't that popular
Simply
Lucy. Unless you feel it's too popular
I like it. Wouldn't change it
Nope
It's ok to use something less formal. It's not like you're royalty right