Latinate feminine form of Felix. It was popular in Britain in the medieval period (with the vernacular forms Felice, Felis), but by the 16th century it had become confused with Phyllis. In modern times it is in only occasional use.
Spanish: habitational name from the city of Zaragoza in northeast Spain, the ancient capital of the kingdom of Aragon. The name derives, via Arabic, from Latin Caesarea Augusta, the name bestowed in the 1st century AD by the Emperor Augustus.