Cognomen Ромулус (Romulus 
, Ромулус 
) , in the world, is quite a rare surname. The last name Ромулус is habitual in Saint Lucia, where it is quite a common surname, Haiti, and Romania. Not in comparison with a country's population, it is commonest in Romania, Haiti, and the United States. Also, Ромулус is the forename as well as the last name.