The word 'bulgar' is originally from Turkish 'bulgur'

'Bulgar' is a word borrowed from Turkish 'bulgur'. The word entered the English language some time around the 14th century.

bulgar [noun] [14th century]

Bulgarian

See 'bulgar' on the Loan Words Map

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note: A cereal food made from whole wheat partially boiled then dried - eaten especially in Turkey.
Etymology: Middle English 'Bulgare' from Medieval Latin 'Bulgarus'

See more loan words from 1300s.