Cognomen Ladar (Ladar 
, Ладар 
, لادار) , throughout the world, is quite a rare last name. The last name Ladar is characteristic of Romania, where it is quite a rare surname, Hungary, where it is a rare surname, and Croatia. Measured by absolute frequency, it is the most numerous in India, Romania, and Algeria. Also, Ladar is the forename as well as the last name.