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“Potoooooooo, reads as POT-8-Os, (1773 – November 1800) was an 18th-century thoroughbred racehorse who won over 30 races and defeated some of the greatest racehorses of the time.

“Bertie, the horse owner, intended to call the young colt "Potato" and instructed the stable boy to write the name on a feed bin. The stable boy spelled the name as "Potoooooooo" (Pot followed by 8 "o"s; that is, a failed attempt at spelling phonetically), which so amused Bertie that he adopted the spelling.”

Learn more about Pot8o on Wikipedia