Piranha

google

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mid 18th century: via Portuguese from Tupi pirá ‘fish’ + sainha ‘tooth’.

wiktionary

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First attested in 1869. [1] The first part of the term is from Old Tupi pirá(“fish”). There are several theories regarding the source of second part, including:

etymonline

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piranha (n.)

also pirana, piraya, "voracious carnivorous fish of tropical America," 1869, from Portuguese piranha, from Tupi (Brazil) pira nya, probably literally "biting-fish," with pira "fish."