Cain is a name of biblical origin, derived from the Old Testament character Cain, the eldest son of Adam and Eve. The name Cain is often associated with themes of sibling rivalry, envy, and punishment, as Cain famously murdered his brother Abel out of jealousy. In modern times, the name Cain is often used as a strong and bold choice for a boy's name. It has a powerful and memorable sound, evoking a sense of mystery and strength. Those named Cain are often seen as independent, determined, and confident individuals.