Cognomen Portoian (Портоян 
, Portoian 
) , worldwide, is a very rare family name. The last name Portoian is habitual in Georgia, where it is a rare surname, Russia, where it is a very rare surname, and Ukraine, where it is an extremely rare surname. In absolute terms, it is the most numerous in Russia, Georgia, and the United States. Also, Portoian is the forename as well as the last name.