Cognomen เอ้ย (Oei 
, Ey 
, เอ้ย) , all over the world, is a common last name. The surname เอ้ย is characteristic of Bermuda, where it is quite a common surname, Maldives, where it is quite a rare surname, and Singapore. In absolute terms, this name is the most popular in Indonesia, Myanmar, and the United States. Likewise, เอ้ย is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Oei | Japan, China, Indonesia, United States, Myanmar |
| Ey | Japan, Indonesia, Egypt, United States, Myanmar |