Marquis

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Middle English: from Old French marchis, reinforced by Old French marquis, both from the base of march2.

wiktionary

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From French marquis, from Old French markis, marchis, from Late Latin marchensis, from Old High German marcha and Frankish *marku, from Proto-Germanic *markō, from Proto-Indo-European *marǵ-(“edge, boundary”).

Meaning is “lord of the march”, in sense of march(“border country”).

etymonline

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marquis (n.)

also marquess, c. 1300, marchis, title of nobility, from Old French marchis, marcheis, marquis, etymologically "a prefect of the marches, ruler of a border area," from Old French marche "frontier," from Medieval Latin marca "frontier, frontier territory" (see march (n.1)). Originally the ruler of border territories in various European regions (compare Italian marchese, Spanish marqués, and see margrave); later a mere title of rank, below duke and above earl or count. Related: Marquisate.