The given name Riley has its roots in the Old English language, originating as a surname derived from the word "ricg," which means "ridge" or "hill." It was initially used as a locational surname referring to someone who lived near a prominent ridge or hill.

In the early Middle Ages, the name was primarily found in England, Scotland, and Ireland, where it was spelled in various forms, such as Riely, Reiley, and Reilly. Over time, it transitioned from being a surname to also being used as a given name.

One of the earliest recorded instances of the name Riley can be traced back to the 13th century, when it appeared in the Hundred Rolls of Oxfordshire, England, in reference to a person named William de la Rygge (from the ridge).

Throughout history, several notable individuals have borne the name Riley. One of the earliest was James Whitcomb Riley (1849-1916), an American writer and poet often referred to as the "Hoosier Poet." He was renowned for his works celebrating Midwestern life and dialect.

Another famous Riley was James Riley (1777-1840), an American sailor and author who wrote a captivity narrative titled "An Authentic Narrative of the Loss of the American Brig Commerce" after being held captive in North Africa.

In the realm of sports, Pat Riley (born 1945) is a celebrated American professional basketball coach and former player, who has won numerous NBA championships as a coach with the Los Angeles Lakers and Miami Heat.

Riley B. King (1925-2015), better known as B.B. King, was an influential American blues singer, songwriter, and guitarist, widely regarded as one of the most influential and renowned blues musicians of all time.

Additionally, Riley Stearns (born 1986) is a contemporary American filmmaker and screenwriter, known for his dark comedies, such as "Faults" and "The Art of Self-Defense."