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 | Japan, China, Malaysia, Myanmar, Mongolia |
| Soi | China, Kenya, Malaysia, India, Myanmar |
| Swei | Indonesia, China, Malaysia, Taiwan, United States |
| سوي | Saudi Arabia, Yemen, Sudan, Egypt, Iraq |