Family name Runaldu (رونالدو 
, Роналдо 
, Runaldu 
) , worldwide, is a rare cognomen. The cognomen Runaldu is habitual in Bulgaria, where it is a rare surname, Sudan, and Saudi Arabia. Not in comparison with a country's population, the name is most common in Sudan, Egypt, and Saudi Arabia. Likewise, Runaldu is the forename as well as the last name.