Click on the red marker on the map below for a link to the FindMyPast transcript. (Free, registration required).
| Ferguson | Very numerous: Ulster & N Connacht. Ir. Mac Fearghusa. Scottish in Ulster and a synonym of Fergus in Connacht.MIF. |
| Mac Fearghusa | Ferguson: féach Ó Fearghuis & rl. |
| Mac Fhearghusa | Ferguson: an-líonmhar: Ulaidh & Connachta thuaidh. Albanaigh den chuid is mó, is cosúil. Thánadar sa 17 céad. |
Parishes where Fergeson and a second surname are both baptised.