Last name Олер (Oller 
, Ohler 
, Oler ) , across the world, is a common cognomen. The surname Олер is habitual in Austria, where it is quite a rare surname, Panama, and Spain. Not in comparison with a country's population, it is the most numerous in the United States, Spain, and Philippines. Very seldom, Олер is the forename as well as the last name.