Surname Adelard (Adelard 
, Adélard , Adelardus) , around the world, is quite a rare family name. The family name Adelard is habitual in Tanzania, where it is quite a rare surname, Malaysia, where it is a rare surname, and Burundi. Not in comparison with a country's population, it is the most numerous in Tanzania, Indonesia, and Malaysia. Also, Adelard is the forename as well as the last name.