Family name ไนย์ (Nai 
, ไนย์ 
) , in all the world, is a widespread cognomen. The last name ไนย์ is habitual in Fiji, where it is quite a common surname, Myanmar, and Malaysia (explore the name in all countries). Measured by absolute frequency, it is commonest in India, Myanmar, and China. Much less frequently, ไนย์ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Nai | China, Myanmar, Malaysia, India, Indonesia |
| ไนย์ | Thailand |