Cognomen Jaij (Size 
, Sise 
, Jaij 
) , worldwide, is quite a rare last name. The family name Jaij is habitual in Gambia, where it is quite a rare surname, Equatorial Guinea, and Norway. Not in comparison with a country's population, it is the most numerous in the United States, Indonesia, and Myanmar. Also, Jaij is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Size | Nigeria, China, Indonesia, United States, Myanmar |
| Sise | Nigeria, Australia, Indonesia, United States, Algeria |
| Jaij | India, Philippines |
| Syse | Canada, United Kingdom, South Africa, United States, Norway |