Vigilante

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mid 19th century: from Spanish, literally ‘vigilant’.

wiktionary

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Borrowed from Spanish vigilante(“watchman, guard”), from Latin vigilans. Doublet of vigilant.

etymonline

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vigilante (n.)

"member of a vigilance committee," 1856, American English, from Spanish vigilante, literally "watchman," from Latin vigilantem (nominative vigilans) "watchful, anxious, careful," from vigil "watchful, awake" (from PIE root *weg- "to be strong, be lively"). Vigilant man in same sense is attested from 1824 in a Missouri context. Vigilance committees kept informal rough order on the U.S. frontier or in other places where official authority was imperfect.