No Kerwyn households in Griffith's.
| Kirwan | numerous: all areas except Ulster, especially the South East, Louth. The Irish is Ó Ciardhubháin, ciar-dhubh = jet black. An erenagh family of Louth and later one of the "Tribes of Galway". IF & SGG. |
| O Ciardhubháin | rare: Ir.Lang. See Kirwan. |
| Ó Ciardubháin | Kirwan: an-líonmhar: go príomha i ndeisceart Laighean & Port Lairge. Airchinnigh i Lú ar dtús iad, ach is mar cheann de "Threabhanna na Gaillimhe" is mó atá trácht orthu. Ciar-dubh = fíor-dubh. Litriú nua: Ó Ciarubháin.IF. |
Parishes where Kerwyn and a second surname are found together
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