Antrim: | 37 | Armagh: | 11 | Belfast city: | 17 | Carlow: | 1 |
Cavan: | 2 | Derry: | 100 | Down: | 35 | Dublin: | 1 |
Fermanagh: | 1 | Galway: | 2 | Kildare: | 1 | Monaghan: | 4 |
Tipperary: | 1 | Tyrone: | 55 |
Mac Uilliam | Mac William: líonmhar: Cúige Uladh & rl. Tháinig an t-ainm Teotanach William .i. Wilhelm (toil + cafarr) leis na Normannaigh agus glacadh mar ainm sinseartha go forleathan leis ach i gCúige Uladh is sloinne Albanach atá i gceist, de ghnáth. |
MacWilliams | numerous: Ulster generally, Dublin etc. Ir. Mac Uilliam (Liam). The first name William, Teutonic Willhelm, meaning "will-helmet", was common amongst the Normans. See also Williams. SI. |
Quilliam | Very rare: Belfast. Ir. Mac Uiliam. May be of Manx origin. |
Williams | Very numerous: all areas. MacLysaght describes it as Welsh, but it is common all over Britain. A Norman first name, adopted from Teutonic Willihelm "resolve-helmet". It has produced many variants. See Mac Williams. Ir. Mac Liam. DBS & DOS. |
Williamson | Very numerous: mainly Ulster where they out-number Williams 2-1. Also Dublin, Cork and Midlands. Believed to be mainly of Scottish origin. See Williams. |
Parishes where McWilliams and a second surname are found together
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