Surname งาย (Ngai 
, งาย 
) , in all the world, is a common cognomen. The surname งาย is habitual in Hong Kong, where it is a common surname, Cayman Islands, and Macao, where it is quite a common surname (explore the name in all countries). Not in comparison with a country's population, it most frequently occurs in Hong Kong, Indonesia, and China. Also, งาย is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Ngai | China, Indonesia, Hong Kong, Myanmar, Taiwan |
| งาย | Thailand |