Surname Chayuk (Chayuk 
, Чаюк 
) , throughout the world, is a rare last name. The cognomen Chayuk is characteristic of Belarus, where it is a rare surname, Ukraine, and Kazakhstan. Measured by absolute frequency, it is the most numerous in Eastern Europe, particularly Ukraine, Russia, and Belarus. Very seldom, Chayuk is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Chayuk | Peru, Ecuador, Russia |
| Чаюк | Ukraine, Belarus, Kazakhstan, Russia |