Cain is a biblical name that refers to the firstborn son of Adam and Eve. It has been used in a variety of contexts throughout history, including literature, mythology, and pop culture. Synonyms for Cain include: murderer, fratricide, killer, slayer, assassin, butcher, and homicide. These words all have similar connotations of violence and death, pointing to the biblical story of Cain murdering his brother Abel out of jealousy and anger. While some may use the name Cain as a symbol of evil or wrongdoing, others may see it as a reminder of the complexity and darkness of human nature.