early 14c., "minor ecclesiastical court officer" (mid-13c. as a surname), from Old French oficial "law officer; bishop's representative" (12c.) and directly from Late Latin officialis "attendant to a magistrate, public official," noun use of officialis (adj.) "of or belonging to duty, service, or office" (see official (adj.)). From mid-14c. as "a domestic retainer in a household;" the meaning "person in charge of some public work or duty, one holding a civil appointment" is recorded from 1550s.
abstract suffix of state, from Old English dom "statute, judgment" (see doom (n.)). Originally an independent word, but already active as a suffix in Old English (as in freodom, wisdom). Cognate with German -tum (Old High German tuom). "Jurisdiction," hence "province, state, condition, quality."
<a href="https://www.etymonline.com/word/officialdom">Etymology of officialdom by etymonline</a>
Harper, D. (n.d.). Etymology of officialdom. Online Etymology Dictionary. Retrieved $(datetime), from https://www.etymonline.com/word/officialdom