Cassar

Cassar is a Maltese surname. 
According to Maltese linguist Mario Cassar, the surname is of Arabic origin, and derives from the Muslim period of Malta. there are also various other proposed origins of the surname.:
The most important representatives of the family are the Cassar Desain, marchese de Sain in Malta and the Cassar Torregiani, one of the richest family in the 19th century in Malta.