Usher

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late Middle English (denoting a doorkeeper): from Anglo-Norman French usser, from medieval Latin ustiarius, from Latin ostiarius, from ostium ‘door’.

wiktionary

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From Middle English ussher, uscher, usscher, from Anglo-Norman usser and Old French ussier, uissier(“porter, doorman”) (compare French huissier), from Vulgar Latin*ustiārius(“doorkeeper”), from Latin ōstiārius, from ōstium(“door”). Akin to ōs(“mouth”). Probably a doublet of ostiary and huissier.

etymonline

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usher (n.)

late 13c., "servant who has charge of doors and admits people to a chamber, hall, etc.," from Anglo-French usser (12c.), Old French ussier, uissier "porter, doorman," from Vulgar Latin *ustiarius "doorkeeper," variant of Latin ostiarius "door-keeper," from ostium "door, entrance," from os "mouth," from PIE *os- "mouth" (see oral). Fem. form usherette is attested from 1913, American English.

usher (v.)

1590s, "conduct, escort, admit ceremoniously," from usher (n.). Related: Ushered; ushering.