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Last name Sylvanus (Sylvanus , Sylvan ) , across the world, is a common surname. The last name Sylvanus is habitual in Grenada, where it is quite a common surname, Nigeria, and Trinidad and Tobago. In absolute terms, it is the most numerous in Sub-Saharan Africa, particularly Nigeria, Tanzania, and Cameroon. Also, Sylvanus is the forename as well as the last name.