Last name Mamoi (Mamoi 
, Мамои 
) , all over the world, is a rare family name. The cognomen Mamoi is habitual in Armenia, where it is quite a rare surname, Georgia, where it is a rare surname, and Portugal, where it is a very rare surname. Not in comparison with a country's population, this name is the most popular in Russia, Armenia, and Malaysia. Likewise, Mamoi is the forename as well as the last name.