Cognomen Sayl (Саил 
, Sayl 
) , worldwide, is a rare surname. The family name Sayl is habitual in Morocco, where it is a rare surname, Venezuela, where it is a very rare surname, and Mexico, where it is an extremely rare surname. Measured by absolute frequency, it is the most numerous in Morocco, Mexico, and the United States. More frequently, Sayl is the forename as well as the last name.