The name Ruy has its origins in the Portuguese and Spanish languages. It is derived from the Germanic name Hrodric, which was composed of the elements "hrod" meaning "fame" and "ric" meaning "power" or "ruler".

Over time, the name evolved into various forms such as Rodrigo, Ruy, and Roy. The name Ruy gained popularity in the Iberian Peninsula during the Middle Ages and was often associated with nobility and chivalry.

One of the earliest and most notable historical figures to bear the name Ruy was Ruy Díaz de Vivar, better known as El Cid Campeador (c. 1043-1099). He was a Castilian nobleman and military leader who became a legendary figure in medieval Spanish literature and folklore for his military exploits and loyalty to the Spanish crown.

Another notable figure in history with the name Ruy was Ruy Barbosa (1849-1923), a Brazilian lawyer, politician, and writer who played a significant role in the drafting of Brazil's first republican constitution and served as the country's finance minister.

In the realm of literature, Ruy Blas is the name of a 19th-century play by French playwright Victor Hugo. The play's protagonist, Ruy Blas, is a valet who falls in love with a noblewoman, highlighting the societal divides of the time.

The name Ruy has also been borne by several artists and intellectuals throughout history, including Ruy de Caminha (c. 1450-1500), a Portuguese explorer and writer who is best known for his account of the first European encounter with Brazil in 1500.

Ruy López de Villalobos (c. 1500-1544) was a Spanish explorer and navigator who led several expeditions to the Pacific Ocean and is credited with discovering the Philippines and several other islands in the region.

While the name Ruy has its roots in the Iberian Peninsula, it has been used across various cultures and time periods, reflecting the diverse and rich history associated with this name.