Deacon

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Old English diacon, via ecclesiastical Latin from Greek diakonos ‘servant’ (in ecclesiastical Greek ‘Christian minister’).

wiktionary

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From Old English diacon, from Ecclesiastical Latin diaconus, from Ancient Greek διᾱ́κονος(diā́konos, “servant, minister”).

etymonline

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deacon (n.)

Middle English deken, "one who reads the Gospel in divine worship, one of a body of assistants to a priest or other clergyman," from Old English deacon, diacon, from Late Latin diaconus, from Greek diakonos "servant of the church, religious official," literally "servant," from dia- here perhaps "thoroughly, from all sides," + PIE *kon-o-, from root *ken- "to hasten, set oneself in motion." Related: Deaconess; deaconship.