The story
After the second Earl of Yarborough (b. 1809), who supposedly bet 1,000 to 1 that such a hand would not occur.
Etymology from Wiktionary, CC BY-SA 4.0.
yarborough
Today it means: A hand, in bridge or whist, that has no card with a value greater than nine (and no aces), though in some circles it is no card above a ten. Full definition →