Dancer

google

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Middle English: from Old French dancer (verb), dance (noun), of unknown origin.

wiktionary

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From Middle English dauncer, dawncere, dancere, equivalent to dance +‎ -er.

etymonline

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dancer (n.)

"one who dances or takes part in a dance," mid-15c., agent noun from dance (v.). As a surname from early 12c. (Godwinus Dancere).