Last name 吉约 (Gillot 
, Guillaud 
, 吉约 
) , in all the world, is a common surname. The cognomen 吉约 is habitual in Guadeloupe, where it is quite a common surname, France, and Mauritius, where it is quite a rare surname. Not in comparison with a country's population, it most frequently occurs in France, Belgium, and the United States. Very seldom, 吉约 is the forename as well as the last name.