Cognomen Сиддхартха (Siddhartha 
, Сиддхартха 
) , worldwide, is quite a rare last name. The cognomen Сиддхартха is habitual in Nepal, where it is a rare surname, United Arab Emirates, and Ireland. Not in comparison with a country's population, it is commonest in India, Indonesia, and Mexico. Much more prevalently, Сиддхартха is the forename as well as the last name.