Last name Gaah (Gaah 
, Гаах 
) , around the world, is a rare surname. The cognomen Gaah is habitual in Kazakhstan, where it is a rare surname, Kyrgyzstan, and Israel, where it is a very rare surname. Not in comparison with a country's population, this name is the most popular in Kazakhstan, Russia, and India. Very seldom, Gaah is the forename as well as the last name.