The story
- Medieval Latin · derived fromdomine fac tōtum“O Lord, do everything”
- English todayfactotum
Ellipsis of domine fac totum, dominus fac totum /dominus factotum (“absolute ruler; head servant”), from Medieval Latin domine fac tōtum (“O Lord, do everything”), also with substition of nominative dominus for vocative domine.
Etymology from Wiktionary, CC BY-SA 4.0.