Pecan

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late 18th century: from French pacane, from Illinois (a North American Indian language).

wiktionary

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Borrowed from French pacane and at first spelt paccan. The French word derives from an Algonquian word, [1] perhaps Miami (Illinois) pakani. Compare Cree pakan(“hard nut”), Ojibwe bagaan, Abenaki pagann, bagôn, pagôn(“nut; walnut, hazelnut”).

etymonline

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pecan (n.)

1712, paccan "the North American pecan tree," or a related hickory, from French pacane, from an Algonquian word meaning "nut" (compare Cree pakan "hard-shelled nut," Ojibwa bagaan, Abenaki pagann, Fox /paka:ni/).