Cognomen Sifon (Sipho 
, Sifon 
, Siphon 
) , worldwide, is quite a rare last name. The last name Sifon is characteristic of Sub-Saharan Africa, particularly Eswatini, where it is quite a common surname, Lesotho, where it is quite a rare surname, and Botswana. Not in comparison with a country's population, it is the most numerous in Nigeria, South Africa, and Argentina. More frequently, Sifon is the forename as well as the last name.