Samael is not to be confused with Samuel first. Samuel means Heard of God. Samael means Venom of God. Both are Hebrew names though.
Samael is one of the 7 arch angels along with Gabriel, Michael, Uriel, Zadkiel, Thaviel, and Raphael. Samael is known as the angel of death. It is said that he took the first born of Egypt. It is also said the he was the one who tempted Eve in the garden of Eden. He was the first to create the nephilim (human and angel halfbreed - Goliath). He is also the first of the fallen angels.
Samael is my real nickname given to me while I was in the US Army. The name is appropriate for me considering I was a sniper.
That said... I do answer to both my given name and Samael in the real world but I do not take after my namesake completely.