Reilly is a common given name and surname of Irish origin. It is derived from the Gaelic name Raghailleach, which means "descendant of Raghallach." The name is often associated with various places in Ireland, as well as notable individuals in sports, entertainment, and politics. In addition to being a personal name, Reilly can also refer to several fictional characters in literature and film. For example, Reilly is a character in the popular movie series The Bourne Identity. The name is versatile and can be used for both males and females, though it is more commonly given to boys.