Family name origins & meanings
- English (of Norman origin) : nickname for a lazy man or a sleepyhead, from Old French dormeor ‘sleeper’, ‘sluggard’ (Latin dormitor, from dormire to sleep).
- English : most probably a habitational name, as medieval forms with de are found, but if so the place of origin has not been identified.
- Irish : when not of the same origin as 1 or 2, this is a reduced Anglicized form of the Donegal name Ó Díorma, a reduced form of Ó Duibhdhíormaigh ‘descendant of Duibhdhíormach’, a personal name composed of Gaelic dubh ‘black’ + díormach ‘trooper’.