If I wanted to try to trace my lines back to Adam, here is where I could try to make an argument…
KIRWIN is a derivation of the Irish name KIRWAN which was one of the Original 9 Tribes of Galway and a Gaelic name. Its original spelling was O'CIARDUIBAIN which gravitated through the CIARROVAN spelling to become KIRWAN or KIRWIN. Today, Irish friends have suggested it is a common as Smith in Ireland.
The Tribe is said to descend from Noah's son Japeth as follows (you can find Noah's Ancestry widely published ;])
NOTE: carrot marks ">" indicate rapid descendency, birth order unknown
[1.4] Japeth, 4th son of Noah
[1.4.2] Magog, 2nd son of Japeth
[1.4.2.4] (The Scythians) Baath, 4th son of Magog
[1.4.2.4.2] Feinus Farsaidh "King of the Scythians in Syria 1700 BC
[1.4.2.4.2.>] Gadel > Esru > Sru > Eber Scott > Beogaman > Tat
[1.4.2.4.2.>.2] Agnomon, 2nd son of Tat
[1.4.2.4.2.>.2.1] Laimfionn, 1st son of Agnomon
[1.4.2.4.2.>.2.1.>] Eibhear Gluinfhionn > Adhnon Fionn > Feibric Glas (Ebric)
> Neanual > Nuadha Nuagatt (Niagatt) > Alldod (Alluid) > Earcada > Deagha
(Deaghatha) > Bregon (Bratha) "The Son of Fire"
[1.4.2.4.2.>.2.1.>.4] Bille, 4th son of Bregon
[1.4.2.4.2.>.2.1.>.4.1] Mille, son of Bille (married Scota; daughter of an Egyptian
Pharoah)
[1.4.2.4.2.>.2.1.>.4.1.3] Ir, 3rd son of Mille and Scota
[1.4.2.4.2.>.2.1.>.4.1.3.>] Eibhear (Emer, Heber) > Ebric (Hebric)
[1.4.2.4.2.>.2.1.>.4.1.3.>.1] Airtre, 1st son of Ebric 1120 BC
[1.4.2.4.2.>.2.1.>.4.1.3.>.1.>] Art (Arthur) > Seadna 960 BC >
Fiachaidh Fionscothach (Fiacha Fionn) > Eochaidh Ollamh Fodhla 924 BC (first to
hold a genealogical and political convention)
[1.4.2.4.2.>.2.1.>.4.1.3.>.1.>.1] Caibre, 1st son of Eochaidh
Ollamh Fodhla
[1.4.2.4.2.>.2.1.>.4.1.3.>.1.>.1.>] Laibhraidh > Bratha > Fionn 715
BC > Siolrlamb "The Long Handed"
[1.4.2.4.2.>.2.1.>.4.1.3.>.1.>.1.>.2] Airgeadmhair (Of the Silver
finger," 2nd son of Siolrlamb 550 BC
[1.4.2.4.2.>.2.1.>.4.1.3.>.1.>.1.>.2.1] Fomor, 1st son of
Airgeadmhair
[1.4.2.4.2.>.2.1.>.4.1.3.>.1.>.1.>.2.1>] Dubh > Rossa > Srubh >
Finn Dearcach (Indereach) > Glass (Green) > Cathfear (Caibre) > Faobhardhil >
Faichen (Fomhar) > Dubh > Sitrige > Dueh > Roderick the Great aka Roceric the
Great (called Clan Rory)
[1.4.2.4.2.>.2.1.>.4.1.3.>.1.>.1.>.2.1>4] Roussa Ruadh (married Roigh
& Macha)
[1.4.2.4.2.>.2.1.>.4.1.3.>.1.>.1.>.2.1>4.1] Fearghus Mac Roigh (Fearghus
Mor), 1st son of Roussa Ruadh & Roigh
[1.4.2.4.2.>.2.1.>.4.1.3.>.1.>.1.>.2.1>4.1.4] Cormac, son of Fearghus
Mac Roigh (Fearghus Mor)
[1.4.2.4.2.>.2.1.>.4.1.3.>.1.>.1.>.2.1>4.1.4.2] Moghtoit, 2nd
of Cormac
[1.4.2.4.2.>.2.1.>.4.1.3.>.1.>.1.>.2.1>4.1.4.2.2] Mocha, 2nd
son of Moghtoit
[1.4.2.4.2.>.2.1.>.4.1.3.>.1.>.1.>.2.1>4.1.4.2.2.>] Cetghun > Enna
> Gobhre > Iuchar > Eoghaman > Alta > Tairc > Teagha > Ethinon >
Orbsenmar > Cormac > Lughach > Bearra > Uisle > Eachdach > Fornert >
Meadhrua > Dubh > Earcoll > Earc > Eachdach > Cuscrach > Fionnfhear >
Onchu > Neidhe
[1.4.2.4.2.>.2.1.>.4.1.3.>.1.>.1.>.2.1>4.1.4.2.2.>.4] Gilligan, 4th
son of Neidhe
[1.4.2.4.2.>.2.1.>.4.1.3.>.1.>.1.>.2.1>4.1.4.2.2.>.4.>] MacCuinn
> O'Cuinn > Quinn of Longford > Kerwin > Kerrigan > Sheridan > O'Birren
> MacBirney > O'Branagan > Bredin > Martin > O'Kenny > O'Ciarrovan
Let me know if you can get the Tribe on down to my Patrick, will you????
Derived from information presented in: A guide to Irish roots; including Celts, Vikings, Normans, Kings, Queens and Commoners by William and Mary Durning; published by the Irish Family Names Society, P.O. Box 2095, La Mesa, CA, USA 91943-2095; 5th printing 1995; ISBN # 0-9601868-3-2