You know a girl is interested in you when she gives you her special name. I had a girlfriend called Tamar who told me early on, "My special friends call me Tammy." I like penetrating these layers of intimacy. I like finding out that the name I call a girl is her special name that others are not invited to call her.
In Orthodox life, I prefer people call me "Levi" rather than "Luke." Luke is my goyisha name. It’s fine for goyim and Jewish goyim. My mishpacha call me "Levi."