The word 'sandwich' comes from a gambling earl - but the story is likely fiction

The food term 'sandwich' is first recorded in 1762, named for John Montagu, 4th Earl of Sandwich, who supposedly invented it so he could eat without leaving the gaming table. That vivid tale traces to a single gossipy French travel account and is widely doubted by historians, who think Montagu more plausibly ate his meat between bread while working late at his desk running the Royal Navy.

— Douglas Harper, Online Etymology Dictionary - 'sandwich' — etymonline.com