For background on how the map was made (and its flaws), see the relevant blog entry.
| 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. |
DEDs where Mac Uilliam and a second surname are found together
This list shows total 1901 Mac Uilliam households by county.
Click on the county to see detail.
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