Surname Sithe (Sithe 
) , throughout the world, is a very rare cognomen. The cognomen Sithe is characteristic of South Africa, where it is a rare surname, the United States, where it is an extremely rare surname, and the United Kingdom. Not in comparison with a country's population, it is commonest in South Africa, India, and the United States. Likewise, Sithe is the forename as well as the last name.