Meaning

noun United States industrialist who manufactured vacuum cleaners (1849-1932)

noun United States lawyer who was director of the FBI for 48 years (1895-1972)

noun 31st President of the United States; in 1929 the stock market crashed and the economy collapsed and Hoover was defeated for reelection by Franklin Roosevelt (1874-1964)

originA genericized trademark of Hoover, the brand name of one of the first vacuum cleaners, which was sold by The Hoover Company. The American company was founded by William Henry Hoover (1849–1932) and his son Herbert William Hoover, Sr. (1877–1954). The surname Hoover is an Anglicized version of the German Huber, originally designating a landowner or a prosperous small-scale farmer.

Etymology from Wiktionary, CC BY-SA 3.0