>
Cognomen Olko (Olko ) , in all the world, is quite a rare last name. The family name Olko is characteristic of Poland, where it is quite a rare surname, the United States, where it is a very rare surname, and Norway. Not in comparison with a country's population, this name is the most popular in Poland, the United States, and Germany. Likewise, Olko is the forename as well as the last name.