Cognomen Sijai (Sijai 
) , across the world, is a rare family name. The surname Sijai is habitual in Tanzania, where it is a rare surname, Malaysia, where it is a very rare surname, and Thailand. More frequently, Sijai is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Sijai | Tanzania, Malaysia, India, United States, Thailand |