|Hastings||numerous: E Ulster, Derry City, Mayo-Galway etc. Ir. Ó h-Oistín from Norse personal name - a sept of N Connacht. In Ulster, it is likely to be English, deriving from the place in Sussex. SGG & DBS.|
|Histon||fairly rare: Limerick-Clare-Cork. Ó h-Oistín (from a Norse first name). A sept of Mayo, who were attached to the MacDermotts. Some of them moved to Limerick. In Connacht, the name has been changed to Hastings. SI & SGG.|
|Ó h-Oistín||Histon: cuíosach annamh: Luimneach-an Clár-Corcaigh. Dream a tháinig ó Chonnachta sa 16 céad ach go mbíonn Hasting orthu sa chúige sin anois. Fréamh: ón ainm Lochlannach Oistin.|
Parishes where Haistin and a second surname are found together
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