What does "first-name" mean?

To address (someone) by first name.

What is a synonym for "first-name"?

Common synonyms include: given name.

verb

verb ·Rare ·Advanced level

Verb

1
To address (someone) by first name. rare
"Physicians are first-named only by close family, friends, and colleagues in the United States. […] First-naming has extended itself to one group who formerly were sacrosanct: teachers and professors. […] Since it is, indeed, a privileged patient who first-names his or her physician, one cannot help feeling, in many such instances, that this is a way of affirming special status."

"She is on a first-name basis with all the customers."

Denominal verb of first name.