In the world, เกรก (Graig 
, Krek 
, Grag 
) is quite a rare boy's forename. The first name เกรก is habitual in the Democratic Republic of the Congo, where it is a rare boy's name, the United States, and South Africa. Likewise, เกรก is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Graig | South Africa, Kenya, United States, India, Democratic Republic of the Congo |
| Krek | Montenegro, Australia, Bosnia and Herzegovina, United States, Slovenia |
| Grag | United Kingdom, South Africa, United States, India, Canada |
| เกรก | Thailand |