Surname Фой (Foy 
, Foye , Фой 
) , in the entire world, is a common cognomen. The surname Фой is habitual in Ireland, where it is quite a common surname, the United Kingdom, where it is quite a rare surname, and Mauritius. Measured by absolute frequency, it is the most numerous in the United States, the United Kingdom, and France. Much less frequently, Фой is the forename as well as the last name.