Cognomen เซ็ก (Sek 
, เซ็ก 
) , all over the world, is a common last name. The family name เซ็ก is characteristic of Malaysia, where it is quite a rare surname, Macao, and Oman. Measured by absolute frequency, this name is the most popular in India, Malaysia, and Poland. More frequently, เซ็ก is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Sek | Poland, India, Malaysia, Saudi Arabia, Algeria |
| เซ็ก | Thailand |