Surname Гийон (Guillon 
, Гийон) , in the entire world, is a common family name. The surname Гийон is habitual in Western Europe, particularly Monaco, where it is quite a common surname, France, and Switzerland, where it is quite a rare surname. Not in comparison with a country's population, it is the most numerous in France, Argentina, and Ivory Coast. Very seldom, Гийон is the forename as well as the last name.