Cognomen Кирби (Kirby 
, Кирби) , across the world, is a common surname. The family name Кирби is characteristic of Saint Vincent and the Grenadines, where it is quite a common surname, Antigua and Barbuda, and Isle of Man (explore the name in all countries). Not in comparison with a country's population, it most frequently occurs in the United States, the United Kingdom, and Australia. Very seldom, Кирби is the forename as well as the last name.