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Cognomen Silas (Silas , Силас , Сайлас ) , throughout the world, is a common last name. The family name Silas is habitual in 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, this name is the most popular in Sub-Saharan Africa, particularly Nigeria, Ethiopia, and Tanzania. Likewise, Silas is the forename as well as the last name.