What is meaning of the name castiel?

Castiel is a name of Hebrew origin, derived from the words "Kaf", meaning "like a god", and "El", meaning "God". Therefore, the full meaning of the name can be interpreted as "like a divine messenger of God". It is also a biblical name and appears in the Hebrew Bible, where it is referred to as the angel who announces the birth of Jesus Christ. Castiel is a popular name among fans of the TV series, Supernatural, where it is the name of an angel character known for his loyalty and strength.