Masochist

google

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late 19th century: named after Leopold von Sacher-Masoch (1835–95), the Austrian novelist who described it, + -ism.

wiktionary

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Leopold von Sacher-Masoch +‎ -ist.

etymonline

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masochist (n.)

"one who is given to masochism," 1895, from masochism + -ist.