Family name Onesimus (Onesimus 
, Онисим 
) , around the globe, is quite a rare surname. The cognomen Onesimus is habitual in Sub-Saharan Africa, particularly Namibia, where it is quite a rare surname, Ghana, where it is a rare surname, and Uganda. Measured by absolute frequency, this name is the most popular in Nigeria, Indonesia, and Uganda. More prevalently, Onesimus is the forename as well as the last name.