Barrier

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late Middle English (denoting a palisade or fortification defending an entrance): from Old French barriere, of unknown origin; related to barre.

wiktionary

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From Middle English barryer, barrere, barryȝer, from Old French barriere (compare French barrière), from Old French barre(“bar”).

etymonline

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barrier (n.)

"anything meant to obstruct entrance," early 14c., barere, from Anglo-French barrere, Old French barriere "obstacle, gatekeeper," from barre "bar" (see bar (n.1)). First record of barrier reef is from 1805.