Family name סיידי (Sadie 
, סיידי ) , all over the world, is quite a common cognomen. The cognomen סיידי is characteristic of Israel, where it is quite a common surname, Botswana, where it is quite a rare surname, and North Macedonia. Measured by absolute frequency, this name is the most popular in Israel, Philippines, and South Africa. More frequently, סיידי is the forename as well as the last name.