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|Guinness||fairly rare: Belfast area and scattered. Ir. Mac Aonghuis, from early personal name Aonghus, Óengus. A sept of Down. See MacGuinness, Magennis. IF.|
|Mac Aonghusa||rare: Dublin etc. Ir. Lang. See Mac Guinness.|
|MacEnnis||Very rare: Limerick. See Mac Guinness.|
|MacGennis||Very rare: Dublin. See Magennis.|
|MacGinnis||Derry etc. Ir. Mag Aonghuis. See Mac Guinness.|
|MacGuinness||Very numerous: all areas, especially Ulster, Connacht, N Leinster. Ir. Mag Aonghusa, Mag Aonghuis. From legendary first name Óengus. A leading sept of Ulster, chiefs of Uíbh Eathach (Iveagh) in Down. Perhaps now most celebrated for the dark beer.|
|Magenniss||numerous: Down-Armagh etc. Ir. Mag Aonghusa. Variant of Mac Guinness, q.v.|
|Maginess||fairly rare: Down-Armagh. See Mac Guinness.|
|Maginnes||fairly numerous: Belfast, Down-Antrim etc. Ir. Mag Aonghusa. Variant of Mac Guinness, q.v.|
|Maguinness||rare: Down etc. Variant of Mac Guinness, q.v.|
Parishes where Maginniss and a second surname are both baptised.
This list shows total Maginniss Roman Catholic baptisms by county and parish.
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