What does the name Sammael mean?

Answer 1

Name of an angel, from sam meaning poison and el meaning angel.
Viewed as either a good or bad angel depending on the mythology. Often though seen as evil. One name of the Angel of Death. Or a prince of demons and a magician.
Often used as another name for Satan or a demon/satan.

Answer 2

it means somewhere along the line, someone in your family misspelled samuel