Personnel

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early 19th century: from French (adjective used as a noun), contrasted with matériel ‘equipment or materials used in an organization or undertaking’.

wiktionary

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From French personnel.

etymonline

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personnel (n.)

1837, "body of persons engaged in any service," from French personnel (originally military, a contrastive term to matériel), noun use of personnel (adj.) "personal," from Old French personel (see personal).