The name Westley is an English given name with origins dating back to the Middle Ages. It is derived from the Old English words "west" and "leah," meaning "west meadow" or "western wood." The name was likely used to describe someone who lived or worked near a western meadow or forest.

In the early medieval period, the name was often spelled as "Westlega" or "Westleage." As the language evolved, spellings such as "Westlee" and "Westleigh" emerged before the modern spelling of "Westley" became common.

One of the earliest recorded instances of the name Westley appears in the Domesday Book of 1086, where it is listed as a place name in Cambridgeshire, England. This suggests that the name was in use as a surname or place name before becoming a widespread given name.

Throughout history, there have been notable individuals who bore the name Westley. In the 13th century, Westley Waterlese was a prominent English judge and clergyman who served as the Archbishop of York from 1265 to 1279.

In the 16th century, Westley Hayles (1515-1590) was an English composer and organist who served at the Chapel Royal during the reign of Queen Elizabeth I.

During the English Civil War in the 17th century, Colonel Westley Richards (1602-1668) was a notable military commander who fought for the Parliamentary forces against King Charles I.

In the 19th century, Westley Richards (1799-1878) was a renowned English gunmaker whose firearms were highly prized for their quality and craftsmanship.

In more recent history, Westley Sidebottom (1901-1982) was a British footballer who played as a goalkeeper for several clubs, including Manchester United and Huddersfield Town.

While the name Westley has roots in England and has been used throughout British history, it has also gained popularity in other parts of the world, particularly in North America, where it continues to be used as a given name.