Transferred use of the Irish surname, Gaelic Ó Nualláin ‘descendant of Nuallán’. The latter is an ancient Gaelic personal name, originally a byname representing a diminutive of nuall ‘chariot-fighter, champion’.
English: habitational name from Inkersall in Derbyshire, recorded in the 13th century as Hinkershil(l) and Hinkreshill. The final element is Old English hyll ‘hill’. The first may be the Old Norse personal name Ingvarr or an Old English byname Hynkere meaning ‘limper’. Ekwall suggests that it may represent a contracted version of Old English hīgna æcer ‘monks’ field’.