Family name Grunia (Груня 
, Grunia 
, גרוניה 
) , across the world, is a rare cognomen. The cognomen Grunia is habitual in Georgia, where it is quite a rare surname, Kyrgyzstan, where it is a very rare surname, and Russia, where it is an extremely rare surname. More frequently, Grunia is the forename as well as the last name.