Beacon

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Old English bēacn ‘sign, portent, ensign’, of West Germanic origin; related to beckon.

wiktionary

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From Middle English beken, from Old English bēacn(“sign, signal”), from Proto-West Germanic *baukn, from Proto-Germanic *baukną (compare West Frisian beaken(“buoy”), Dutch baken(“beacon”), Middle Low German bāke(“beacon, sign”), German Bake(“traffic sign”), Middle High German bouchen(“sign”)), perhaps from Proto-Indo-European *bʰeh₂u-, *bʰeh₂-(“to shine”).

etymonline

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beacon (n.)

Old English beacen "sign, portent, lighthouse," from West Germanic *baukna "beacon, signal" (source also of Old Frisian baken, Old Saxon bokan, Old High German bouhhan); probably from Proto-Germanic *baukna- "beacon, signal," from suffixed form of PIE root *bha- (1) "to shine." Figurative use from c. 1600.