|Mac an Mháighistir||Mac Master, Masterson: líonmhar: Cúige Uladh go sonrach. Craobh de Mhic Thighearnáin i mBreifne go bhfuil Masterson orthu anois. Sloinne Albanach ó Ghallghallaibh, chomh maith.|
|MacMaster||numerous: mainly E Ulster. Ir. Mac an Mhaighistir, son of the master. They were generally of Scottish origin from Galloway. An indigenous sept, related to the Maguires of Fermanagh, now usually appears as Masterson, q.v. MIF & SS.|
|Masters||fairly rare: Ulster etc. An English name but may stand for Mac Master, q.v.|
|Masterson||numerous: Ulster, Connacht, N Midlands, South East. Ir. Mac an Mháighistir (son of the master). This name represents (1) a sept of Breifne, related to the Maguires. (2) Scottish immigrants in N E Ulster. (3) 16 cent English immigrants in Wexford. See also Mac Master. MIF.|
Parishes where McMasters and a second surname are found together
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