Jack. Derived from John or Jacques. They were in Co. Kilkenny in the south - west of Southern Leinster early on where is Jackstown. Now numerous in Co. Donegal, Co. Tyrone and Co. Antrim in the Ulster Province.

Jackman or Jekeman. English origins. They were originally in Co. Kilkenny in the south - west of Southern Leinster now also in Co. Waterford in the south - east of the Munster Province.

Jackson or Jakson. English origins. They have been in the Ulster Province since the Mid - 17th Century AD after the Confiscation of the 3,500,000 acres of the Heremonian Ui Cobhthaigh Dal Cuinn "Northern" Ui Niaill territories there and the Foreign non - Catholic Plantations there .

Jacob. English origins. They came from Cornwall in the 14th Century AD and those in Co. Wexford and Co. Laois in Southern Leinster were there in the 17th Century AD.

Jago. Cognate with Jacob. They came from Cornwall into Ireland in the 16th Century AD known as Mac Ego and Mac Kigo / Mac Iago. Now in Co. Cork in Southern Munster.

Jago. Used by a Sept / Family branch of the O Hanleys, which see, known as Igoe who had their territory in Co. Roscommon in the east of the Connacht Province and nearby in Co. Longford in the north - west of Northern Leinster.

James. English origins. Recent immigrants who were mainly in the north - east of the Ulster Province.

James. Used as an abbreviation for Mac James and Fitz James. Formed from the Christian names of some members of one of the larger Septs or more often Norman families. Now numerous in Co. Carlow and Co. Wicklow in Southern Leinster.

Jameson. Scottish origins. They were in Ireland since the Mid - 18th Century AD. See also Keamish.

Janico or Jenico -

Jans -

Jeffares. English origins. Used as variants for Jeffreys, which see ( Descended from a son of Jeffrey or Geoffrey). They were in Ireland in the second half of the 17th Century AD. As Jeffares they were in Co. Waterford in the south - east of the Munster Province.

Jeffers. English variant of Jeffreys used in the second half of the 17th Century AD. Mainly in Co. Cork in Southern Munster, Co. Carlow and Co. Dublin in the north - east of Southern Leinster. Now numerous in Co. Antrim in the north - east of the Ulster Province and surrounding regions. When used as a synonym with Jeffreys it may also be for Mac Shaffrey, which see. Jeffords, which is used as a variant for Gifford has no connection.

Mac Jeffries. An Irian Conmaicne Magh Rein Muintir Anghaile Sept / Family branch of the O Farrells / O Ferralls / Ui Fearghaile, who had their territory in Co. Longford in the north - west of Northern Leinster in 1659 AD, but are now found mostly in Co. Derry and nearby in Co. Donegal in Northern Ulster. Especially see - Mac Shaffrey.

Jeffrey. They are in Co. Cork in Southern Munster. Also see previous two entries.

Jeffreys. See - Jeffers or Mac Shaffrey. Jeffreystyown in Co. Westmeath in the south - west of Northern Leinster was previously known as Ballyhaffray in 1569 AD.

Jenkins.See - Shinkwin.

Jennings. Gaelic / Mheic Sheoinin. Taken up by one of branches of the Burkes, which see, in Co. Galway and Co. Mayo in the west of the Connacht Province. See also - Kilmaine.

Jennings. From the Norse diminutive Jen or Jan. Used in the Heremonian Ui Cobhthaigh Dal Cuinn 3 Colla kingdom of Orghialla / Airghialla / Oriel in Southern Ulster and Co. Louth in the north - east of Northern Leinster.

Jerety. Used as a variant for Mac Geraghty, which see, in Co. Westmeath in the south - west of Northern Leinster.

Jermyn / le Germain (the German). They have been mainly in the Munster Province since the 13th Century AD.

Jervois or Jervis. French origins. Originally known as Gervais since the 14th Century AD and since the Mid - 17th Century AD they have been situated around Co. Cork in Southern Munster.

Jevery -