The story
- Latin · derived fromAtirius
- Medieval Latin · derived fromAdiraco
- English todayDirac
From the French surname Dirac, probably from the French town by that name in Charente, from Medieval Latin Adiraco, Dyracum, from a Gallo-Roman name, Latin Atirius (a derivative of Atilius), or alternatively a Frankish/Germanic name *Adarus, in either case with the common Gallo-Roman nominal suffix -acum.
Etymology from Wiktionary, CC BY-SA 4.0.