Surname سوي (Sui 
, Soi 
, Swei 
) , across the world, is a widespread cognomen. The surname سوي is habitual in Mongolia, where it is a widespread surname, Malaysia, where it is quite a common surname, and Cayman Islands (explore the name in all countries). Not in comparison with a country's population, it is commonest in China, Mongolia, and Malaysia. Much less frequently, سوي is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Sui | Mongolia, Malaysia, Myanmar, China, Japan |
| Soi | Malaysia, Myanmar, China, Kenya, India |
| Swei | Malaysia, China, Taiwan, United States, Indonesia |
| سوي | Yemen, Sudan, Saudi Arabia, Iraq, Egypt |