It's funny you should ask that question. I've been researching that same question myself for about five years trying to determine if the Palatine Davins are related to my Davin ancestors who settled in Fort Plain, Canajoharie, Gloversville and Johnstown NY area. My grandfather John Davin and his brother Michael stayed with an uncle Thomas Davin in Canajoharie when they arrived from Clifden. I noticed that the Davin family you mentioned lived close to them at that time in Palatine Bridge and when I saw that a website mention your Davins were from Clifden, I assumed they were related but to date I have been unable to prove it despite extensive research. I'm convinced that all Davins from Clifden are related. The 1855 Griffiths Valuation for Fahy Clifden shows that five of the 21 families listed at that time were Davins. Rental records for that section of the Sky Road show much movement between cottages for these Davins.
The funny thing was I was up in the Johnstown NY area recently for a Davin cousin family function and checked cemeteries there trying to find your John Davin's grave to see if his headstone might show where in Ireland he was from. I have his death certificate 1/24/1891 from Brooklyn where he was visiting when he died which shows he was buried in the Johnstown cemetery. His obit shows he was buried in St. Mary's Cemetery. I found out this visit that neither St. Mary's church or the cemetery still exist. I still haven't checked Johnstown cemetery. I live near Boston by the way so I don't get up there too often.
I started researching your Davins in hopes of finding more Davin cousins when I saw there was a Delia Davin in the family. My grandfather's brother's marriage certificate shows a Delia Davin as a witness. With the close proximity of the Palatine Davins and a daughter Delia I was sure they were cousins. I have been unable to find any connection other than one web site which shows John was born in Clifden. At this point I'm not sure it was your Delia
Davin who was the witness because I believe she was married at the time of the wedding and living in Johnstown.
Here's what I think I know based on census records, city directories, church records and newpaper items:
The oldest daughter Mary Davin was born in Ireland and married a Shults. There is quite an extensive family history of the Shults on line. I have a note in my papers that Mary was born in Ireland in 1859 and died in Johnstown 3/16/1901, that her mother was Mary? Connelly and father John Davin and that she married Charles Shults around 1880. On this note I have written Brackloon, Shurle, Mayo, Ireland. I didn't write a source for this info but I'm sure I got it off a web site some place. I think this web site indicated they were from Mayo but who knows.
I believe there was another son Peter who was also born in Ireland in 1861 but doesn't show up on the 1880 census. I found what I believe is Peter's birth certificate. The web site shows there was only one Peter Davan (a common spelling of Davin in Ireland) born around 1860 in Clifden with a father John Davan and mother Bridget Connilly. Peter married Flora Reek and had a son John (b 1889)and daughter Irene. This family lived in Schenectady NY.
I think there was another daughter Anna born in Ireland in 1867. She may have married a Kelly and lived in Johnstown also. I saw a note in the paper that said Irene Davin of Schenectady was visiting her cousin Marie Kelly of Johnstown.
Delia Davin married Patrick Fleming in 1895 hence the Fleming Pages family tree on Tribal Pages I think. They lived in Johnstown NY. The 1900 census shows Thomas Fleming (I think Thomas is his correct name) with his wife
Delia, three children John, Mary and Raymond, two brothers Michael and Thomas and mother in law Bridget Davin. In 1920, the census shows only Michael and Thomas still living in Johnstown. The 1930 census shows a Flora Davins age 56 living in Johnstown (maybe Peter's wife?)
So that's basically what I have on the Palatine Davins. Hope this help more than it confuses.
I would love to know more about your Davin/Fleming family, especially why you think they were from Clifden. Are your Fleming ancestors also from Clifden? Regards, Bill Burke