Cognomen Roustas (Roustas 
) , in all the world, is a rare family name. The surname Roustas is habitual in Greece, where it is quite a rare surname, Canada, where it is a very rare surname, and Germany, where it is an extremely rare surname. Not in comparison with a country's population, it is commonest in Greece, Canada, and the United States. Very seldom, Roustas is the forename as well as the last name.
Mr, Konstantin, Athanasios, Anastasios, Alexandros, Vasileios, Emmanouil, Vassilis, Nikolaos, Georgios, Politimi, Christos, Michalis, Carmela, Michail, George, Petros, Kostas, Stella, Markos, Zisis, Effie, Nikos, Lucas, Louis, Bobby, Nick, Bill, Mike, Jim, Panagiotis, and Konstantinos