Cognomen Groin (Groin 
) , all around the world, is a very rare surname. The last name Groin is habitual in France, where it is a very rare surname, Israel, and the United Kingdom, where it is an extremely rare surname. In absolute terms, the name is most common in France, the United States, and the United Kingdom. Much less frequently, Groin is the forename as well as the last name.