fanyoudaoicibaDictYouDict[fan 词源字典]
fan: English has two words fan. By far the older [OE] came from Latin vannus; it originally meant ‘device for winnowing grain’, and its now familiar sense ‘handheld device for creating a cooling draught’ did not develop until the 16th century. Its characteristic semicircular shape gave rise to the term fanlight [19] (since applied to a rectangular window above a door). Fan ‘supporter’ is short for fanatic. There is a one-off example of its use in the 17th century, in New news from Bedlam 1682, but the origins of the modern word were in late 19th-century America, where it was used for sports supporters.
[fan etymology, fan origin, 英语词源]
fan (n.1)youdaoicibaDictYouDict
device to make an air current, Old English fann (West Saxon) "a basket or shovel for winnowing grain" (by tossing it in the air), from Latin vannus, perhaps related to ventus "wind" (see wind (n.1)), or from PIE root *wet- (1) "to blow" (also "to inspire, spiritually arouse;" see wood (adj.)).

The chaff, being lighter, would blow off. Sense of "device for moving air" first recorded late 14c.; the hand-held version is first attested 1550s. A fan-light (1819) was shaped like a lady's fan. The automobile's fan-belt is from 1909. Fan-dance is from 1872 in a Japanese context; by 1937 as a type of burlesque performance.
fan (n.2)youdaoicibaDictYouDict
"devotee," 1889, American English, originally of baseball enthusiasts, probably a shortening of fanatic, but it may be influenced by the fancy, a collective term for followers of a certain hobby or sport (especially boxing); see fancy (n.). There is an isolated use from 1682, but the modern word likely is a late 19c. formation. Fan mail attested from 1920, in a Hollywood context; Fan club attested by 1930.
Before the close of the republic, an enthusiastic partisan of one of the factions in the chariot races flung himself upon the pile on which the body of a favourite coachman was consumed, and perished in the flames. [Lecky, "European Morals"]
fan (v.)youdaoicibaDictYouDict
late Old English fannian "to winnow (grain)," from the noun (see fan (n.1)). Meaning "to stir up air" is from early 15c. Baseball sense of "strike out (a batter)" is by 1909. Related: Fanned; fanning. To fan out "spread out like a hand-held fan," is from 1590s.