Castiel is an angelic name built on the pattern of Gabriel and Cassiel, ending in the Hebrew el, "God"; the first element is uncertain, and the name is usually treated as a variant of Cassiel. It reached American parents through the angel Castiel in the TV series Supernatural, played by Misha Collins from 2008. In the United States Castiel entered the top 1000 in 2013, peaked at number 723 in 2019 and ranks number 1009 in 2025.