Family name Флаг (Flago 
, Vlag 
, Флаг 
) , throughout the world, is quite a rare cognomen. The cognomen Флаг is characteristic of Netherlands, where it is quite a rare surname, India, where it is a very rare surname, and Switzerland. Not in comparison with a country's population, the name is most common in India, Netherlands, and Russia. Much less frequently, Флаг is the forename as well as the last name.