Khan

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late Middle English: from Old French chan, medieval Latin canus, caanus, from Turkic ḵān ‘lord, prince’.

wiktionary

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Via late Middle English can, chan from Old French chan, from Medieval Latin chanis, from Turkic *qan, contraction of *qaɣan. [1] Cognate with Old Turkic 𐰴𐰍𐰣‎ (qaɣan), and Mongolian ᠬᠠᠭᠠᠨ(qaɣan), хаан(khaan).

From Persian خان‎ (xân, “caravanserai”).

etymonline

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khan (n.)

title of sovereign princes in Tatar counties, c. 1400, from Turkic, literally "lord, prince," contraction of khaqan "ruler, sovereign." The word has been known in the languages of Europe since 13c.; compare Medieval Latin chanis, Medieval Greek kanes, Old French chan, Russian khanu. In time it degenerated and became a title of respect. The female form is khanum (1824), from Turkish khanim.