Surname Cierr (Ajar 
, Cierr 
) , throughout the world, is quite a rare cognomen. The last name Cierr is characteristic of Georgia, where it is quite a rare surname, Morocco, where it is a rare surname, and Malaysia. In absolute terms, it is the most numerous in Indonesia, India, and Morocco. More frequently, Cierr is the forename as well as the last name.