Cognomen Roin (Roin 
, Роин 
, Runger 
) , globally, is quite a rare last name. The family name Roin is habitual in Georgia, where it is quite a common surname, Denmark, where it is a rare surname, and Indonesia. In absolute terms, it is commonest in Georgia, Indonesia, and Myanmar. Also, Roin is the forename as well as the last name.