Cognomen Силас (Silas 
, Силас 
) , all over the world, is a common last name. The last name Силас is characteristic of Vanuatu, where it is a common surname, Namibia, where it is quite a common surname, and Nigeria (explore the name in all countries). Measured by absolute frequency, it is commonest in Sub-Saharan Africa, particularly Nigeria, Ethiopia, and Tanzania. Also, Силас is the forename as well as the last name.