Cognomen Диану (Dianu 
, Диану 
) , all around the world, is a rare family name. The surname Диану is habitual in Romania, where it is quite a rare surname, New Zealand, where it is a very rare surname, and Nigeria. Measured by absolute frequency, it is the most numerous in Romania, Nigeria, and Spain. Also, Диану is the forename as well as the last name.