Surname Lagey (Lagey 
) , around the world, is a very rare cognomen. The cognomen Lagey is characteristic of Belgium, where it is a rare surname, France, where it is a very rare surname, and the United Kingdom, where it is an extremely rare surname. Not in comparison with a country's population, it is commonest in Belgium, France, and the United States. Very seldom, Lagey is the forename as well as the last name.