Surname Бертьє (Berthier 
, Бертьє) , in the entire world, is a common last name. The family name Бертьє is characteristic of Saint Lucia, where it is quite a common surname, Guadeloupe, and France. Not in comparison with a country's population, this name is the most popular in France, Brazil, and Benin. Much less frequently, Бертьє is the forename as well as the last name.