Why sicilians , used to call muslims in sicily ; " SARACENS" ?

Question

I am talking about 800 years ago .

Answer 1

The term Saracen comes from Greek Σαρακηνός, which has often been thought to be derived from the Arabic word شرقيين ("easterners"), though the OED  calls etymologies from this "not well founded". The term spread into Western Europe through the Byzantines and Crusaders. After the rise of Islam, and especially at the time of the Crusades, its usage was extended to refer to all Muslims, including non-Arab Muslims, particularly those in Sicily and southern Italy.

In Christian writing, the name was made to mean "those empty of Sarah" or "not from Sarah," as Arabs were, in Biblical genealogies, descended from Hagar and also called the Hagarenes (Ἀγαρηνοί).

Answer 2

bravo shakespear ...absolutley right.. ...question? where the berbers related to the hagars or the bedouin?