Cassian

From the Roman family name Cassianus, which was derived from CASSIUS. This was the name of several saints, including a 3rd-century martyr from Tangier who is the patron saint of stenographers and a 5th-century mystic who founded a monastery in Marseille.

CASSIUS   male   Ancient Roman, English
Roman family name which was possibly derived from Latin cassus "empty, vain". This name was borne by several early saints. In modern times, it was the original first name of boxer Muhammad Ali (1942-2016), who was named after his father Cassius Clay, who was himself named after the American abolitionist Cassius Clay (1810-1903).
EQUIVALENTS
ANCIENT ROMAN: Cassianus
OTHER FORMS
ANCIENT ROMAN: Cassia, Cassius
ENGLISH: Cassius, Kassia