Cognomen سيسلي (Cecile 
, Cecily 
, Sisley 
) , across the world, is quite a common surname. The last name سيسلي is characteristic of Sub-Saharan Africa, particularly Reunion, where it is quite a common surname, Seychelles, and Mauritius. Measured by absolute frequency, it is commonest in Cameroon, France, and the United States. More frequently, سيسلي is the forename as well as the last name.