on a first-name basis

Idioms  

1. Quite familiar and friendly, as in Practically all the guests were on a first-name basis. This idiom alludes to the fact that using a person's given name betokens familiarity. [Second half of 1900s]

---

Example Sentences

See Examples For:

on a first-name basis

For decades, Graham was on a first-name basis with world leaders and among the most plugged-in Beltway insiders regardless of who occupied the White House.

From The Wall Street Journal ● Jul. 14, 2026

Before that day, Kani had never made the acquaintance of a white person on a first-name basis.

From Los Angeles Times ● Apr. 14, 2026

“They’re on a first-name basis and know their pets and family members. It’s easier to advise on complex conditions and provide the care they need versus a transactional experience.”

From Seattle Times ● May 31, 2024

Locals are on a first-name basis with significant nearby fires, and they become familiar conversational touchstones.

From Slate ● Sep. 18, 2023

“We’re on a first-name basis, so why does it even matter?”

From "Dry" by Neal Shusterman and Jarrod Shusterman