The name Cassiel is a boy's name of Latin origin meaning "angel of Saturday". Cassiel and is often added to lists like Mystical Names and discussed in our forums with posts like "Compromise and pass it on!".
From the experts:
This name of the archangel who protects those born under the sign of Capricorn is one of the most attractive and distinctive names for babies born in December or January. Cassiel is an unknown member of the increasingly popular Cass family, which includes Cassius, Cassian, and Cassia.