Surname เอ่ย (Oei 
, เอ่ย) , globally, is a common cognomen. The last name เอ่ย is characteristic of Bermuda, where it is quite a common surname, Singapore, where it is quite a rare surname, and Indonesia. Measured by absolute frequency, the name is most common in Indonesia, the United States, and Netherlands. Also, เอ่ย is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Oei | Singapore, United States, Indonesia, Japan, Malaysia |