Last name Dayk (Dayk 
, دایک , Дайк 
) , throughout the world, is a rare family name. The family name Dayk is habitual in Iraq, where it is a rare surname, Bulgaria, and Kyrgyzstan, where it is a very rare surname. Not in comparison with a country's population, this name is the most popular in Iraq, Bulgaria, and Russia. More frequently, Dayk is the forename as well as the last name.