Cognomen Ваик (Vaik 
, Ваик 
) , around the world, is a rare family name. The cognomen Ваик is characteristic of Estonia, where it is quite a common surname, Hungary, where it is a rare surname, and Georgia, where it is a very rare surname. In absolute terms, this name is the most popular in Estonia, India, and Hungary. Very seldom, Ваик is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Vaik | Estonia, Hungary, United States, India, France |
| Ваик | Kazakhstan, Russia |