For background on how the map was made (and its flaws), see the relevant blog entry.
|Donnan||numerous: Down etc. Ir. Ó Donnáin, derived from the early personal name Donn probably meaning "lord". Not to be confused with Doonan, q.v. SI.|
|Ó Donnáin||Donnan: líonmhar: an Dún & rl. Díspeagadh ar an ainm Donn a chiallaíonn "donn" nó b'fhéidir "rí, tighearna". GPN &MIF.|
DEDs where Donnan and a second surname are found together