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Origin and history of yam

yam(n.)

tuberous root, used as food, native to tropical regions, 1580s, igname (current form by 1690s), from Portuguese inhame or Spanish igname, from a West African language (compare Fulani nyami "to eat;" Twi anyinam "species of yam"). The word in American and Jamaican English probably is directly from West African sources. The Malay name is ubi, whence German öbiswurzel. The name was transferred in U.S. South to a variety of sweet potato.

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Trends of yam

adapted from books.google.com/ngrams/ with a 7-year moving average; ngrams are probably unreliable.

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