Seller

wiktionary

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From Middle English seller, sellere, (also siller, sullar, sullere), from Old English *sellere, *syllere, equivalent to sell +‎ -er. Cognate with Danish sælger, Swedish säljare, Icelandic seljari(“a seller; dealer”).

Alternative forms.

etymonline

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seller (n.)

c. 1200, agent noun from sell (v.).