Last name Байяр (Bayard 
, Байяр 
) , around the world, is quite a common surname. The cognomen Байяр is characteristic of France, where it is quite a rare surname, Haiti, and Switzerland. Not in comparison with a country's population, the name is most common in France, the United States, and Haiti. Very seldom, Байяр is the forename as well as the last name.