Sheriff

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Old English scīrgerēfa (see shire, reeve1).

wiktionary

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From Middle English shirreve, from Old English scīrġerēfa, corresponding to shire +‎ reeve. There is no etymological connection to Sharif ( شَرِيف‎ (šarīf)), an Arabic title of honour that has cognates in other languages including Hindi, Urdu, Portuguese, etc.

etymonline

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sheriff (n.)

late Old English scirgerefa "representative of royal authority in a shire," from scir (see shire) + gerefa "chief, official, reeve" (see reeve). As an American county official, attested from 1660s; sheriff's sale first recorded 1798. Sheriff's tooth (late 14c.) was a common name for the annual tax levied to pay for the sheriff's victuals during court sessions.