Surname Olag (Olag 
, Олаг 
) , globally, is quite a rare cognomen. The last name Olag is characteristic of Ukraine, where it is quite a rare surname, Kazakhstan, where it is a rare surname, and Philippines, where it is a very rare surname. In absolute terms, the name is most common in Ukraine, Philippines, and Russia. Much less frequently, Olag is the forename as well as the last name.