The founder of J C Penney was James Cash Penney. So the J stands
for James, the C stands for Cash, and the Penney is his last name.
So the store is named after the founder.
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J C Penney is an American department store chain founded in 1912
by James Cash Penney.
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The "J" in J.C. Penney stands for James, after the founder, James Cash Penney.