Cognomen Oolu (Oolu 
) , throughout the world, is a very rare surname. The cognomen Oolu is characteristic of Estonia, where it is quite a rare surname, Myanmar, where it is a very rare surname, and Canada, where it is an extremely rare surname. Not in comparison with a country's population, it most frequently occurs in Myanmar, Estonia, and India. Also, Oolu is the forename as well as the last name.