The name Spencer has its origins in the medieval English language, derived from the Old French word "despensier," which means "steward" or "keeper of provisions." The name originated in the 12th century and was initially used as an occupational surname for those who worked as stewards or oversaw household provisions.

In the early 13th century, the name gained prominence when Hugh le Despenser became a powerful nobleman and royal adviser to King Edward II of England. He held the position of Lord Chamberlain and was instrumental in the administrative and financial affairs of the kingdom. However, his involvement in the overthrow of Edward II and the subsequent persecution of the queen led to his eventual execution in 1326.

The name Spencer began to be used as a given name in the late Middle Ages, although it remained relatively uncommon until the 16th century. One of the earliest recorded examples of the name as a given name was Spencer Compton, born in 1601, who later became the 2nd Earl of Northampton.

Throughout history, several notable individuals have borne the name Spencer. One of the most famous was Spencer Perceval (1762-1812), who served as the Prime Minister of the United Kingdom from 1809 until his assassination in 1812, making him the only British Prime Minister to be assassinated.

Another prominent figure was Spencer Trask (1844-1909), an American banker and philanthropist who played a significant role in financing various industries, including railroads and mining ventures.

In the literary world, Spencer Fullerton Baird (1823-1887) was an American naturalist and the first curator of the Smithsonian Institution, while Spencer Tracy (1900-1967) was a renowned American actor who won two Academy Awards and was nominated nine times.

Spencer Cavendish (1833-1908), the 8th Duke of Devonshire, was a prominent British statesman and politician who served as Lord President of the Council and Leader of the House of Lords.

The name Spencer has maintained a steady presence throughout history, reflecting its origins as an occupational surname and its eventual adoption as a given name among the English nobility and upper classes. While its popularity has fluctuated over time, it has endured as a name with a rich historical legacy.