For background on how the map was made (and its flaws), see the relevant blog entry.
|Cotter||Very numerous: mainly Cork and Munster, E Ulster. Ir. Mac Coitir, originally Mac Oitir, from a Norse personal name (the Gaels were quite prepared to adopt foreign names). The name has always been associated with Cork. IF.|
|Mac Coitir||Cotter: an-líonmhar: Mumhain, i gCorcaigh ach go h-áirithe. Ón ainm Lochlannach Ottar. Bhí siad suite ag Carraig Thuathail, Corcaigh.SGG & IF.|
|MacCotter||Quite numerous: Antrim etc. Ir. Mac Oitir, from Norse first name Ottar. Primarily Scottish as the name is always Cotter in the south and Irish is Mac Coitir.|
DEDs where Cotter and a second surname are found together