Family name Арнай (Arnay 
, Арнай 
, Arnai 
) , across the world, is a rare last name. The family name Арнай is characteristic of Uruguay, where it is a rare surname, Spain, and Argentina. Not in comparison with a country's population, the name is most common in Spain, Argentina, and Thailand. Likewise, Арнай is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Arnay | Argentina, United States, Venezuela, India, Spain |
| Арнай | Armenia, Kyrgyzstan, Kazakhstan |
| Arnai | United States, Thailand, Venezuela, India, Spain |