Cognomen Nainai (奶奶 
, Nainai 
) , throughout the world, is a rare surname. The family name Nainai is habitual in Myanmar, where it is a rare surname, Tanzania, where it is a very rare surname, and Morocco. Measured by absolute frequency, it most frequently occurs in Myanmar, China, and Tanzania. More prevalently, Nainai is the forename as well as the last name.