Cognomen גואי (Guay 
, גואי 
) , throughout the world, is a common last name. The cognomen גואי is habitual in Canada, where it is quite a common surname, New Zealand, where it is quite a rare surname, and Guatemala. Not in comparison with a country's population, the name is most common in Canada, the United States, and Philippines. Very seldom, גואי is the forename as well as the last name.