Thomas Nevin’s Ancestors

[Maiden Stone]

A James Navin born 1864- mother Stahan?
https://civilrecords.irishgenealogy.ie/churchrecords/images/birth_returns/births_1864/03604/2329504.pdf

Strahan?

[aghadowey]

A James Navin born 1864- mother Stahan?
https://civilrecords.irishgenealogy.ie/churchrecords/images/birth_returns/births_1864/03604/2329504.pdf

Strahan?

More likely.

Can only get a bit of this but might be interesting-
Roscommon Messenger, 21 May 1910: M'DONNELL V NEVIN. John M'Donnell, Lanesboro’ Road, sought an ejectment the title against Thomas Nevto [Nevin?], Corbo, respect the lands of Corbo, containing 19a 35p [3r 5p more likely]. Mr Maurice Staunton, solicitor, Castlerea, appeared for plaintiff, and M Moran for the Mr ...
 
Roscommon Messenger, 16 Jan.1909: Death and Funeral of Mr Michael Flynn, Corbo. The death took place at his residence, Corbo, Kilrooskey, on the 9th inst, of Michael Flynn, at the ripe age of 82 years. Deceased fought in the ...

Roscommon Messenger, 1 May 1909: DISQUALIFIED ON GROUND OF RESIDENCE. The Clerk stated that in the case of Ellen Nevin, Corbo, Kilrooskey, the pension officer reported that she was not qualified on the ground of residence. The Pension Officer ...

[aghadowey]

A bit more-
Roscommon Messenger, 16 Jan.1909: Death and Funeral of Mr Michael Flynn, Corbo. The death took place at his residence, Corbo, Kilrooskey, on the 9th inst, of Michael Flynn, at the ripe age of 82 years. Deceased fought in the American Civil War and was in receipt of a pension from the American ...

A few avenues to try-
There are Civil War Pension records (Ancestry? possibly Find My Past?)
There are also records of incoming and outgoing U.K. Passenger lists (1890-1960 I think)

[Maiden Stone]

There's a Michael Navin born 1869 with parents Thomas Navin & Ellen Shruffin-
https://civilrecords.irishgenealogy.ie/churchrecords/images/birth_returns/births_1869/03407/2249591.pdf

A James Navin born 1864- mother Stahan?
https://civilrecords.irishgenealogy.ie/churchrecords/images/birth_returns/births_1864/03604/2329504.pdf

Another James Navin born 1864 with parents Thomas Nevin & Ellen Sher_-
https://civilrecords.irishgenealogy.ie/churchrecords/images/birth_returns/births_1864/03604/2329510.pdf

If you can find baptismal records for these 3 plus your Thomas it might help with your family tree.
https://registers.nli.ie/

 How do I get the baptism certificates?

Michael's baptism was in Athleague parish on 1st Feb. 1869. Ellen's surname looks like Strachan to me. Godparents Burke.
I didn't spot a baptism for James. There were 2 runs of registers containing baptisms in 1864. They confused me. There may be entries missing or out of order.
https://registers.nli.ie/parishes/0537
Tip - be flexible when looking for baptisms & birthdates. D.o.b. in births register may not have been accurate. Registration of births was a new thing. 

[Maiden Stone]

Michael's baptism was in Athleague parish on 1st Feb.
I didn't spot a baptism for James. There were 2 runs of registers containing baptisms in 1864. They confused me. There may be entries missing or out of order.
https://registers.nli.ie/parishes/0537

1 register seems to finish July 1864. Rest of page blank. Following page is marriages. (Unless there are more baptisms after marriage register.) Next baptism register begins Nov. 1864. Then another baptism register begins Jan. 1865. Perhaps registers from different chapels in the parish or kept by different priests.

[aghadowey]

A James Navin, age one died 7 Aug.1865 Roscommon registration district. (certificate not yet online)

[Maiden Stone]

A James Navin born 1864- mother Stahan?
https://civilrecords.irishgenealogy.ie/churchrecords/images/birth_returns/births_1864/03604/2329504.pdf

Strahan?

More likely.

Michael's baptism was in Athleague parish on 1st Feb. 1869. Ellen's surname looks like Strachan
 

Variants listed in "Varieties & Synonyms of Surnames and Christian Names in Ireland" by Robert Matheson, Registrar-General of Ireland. These were recorded by registrars around Ireland:
STRAHAN - STRACHAN, STRAGHAN, STRAIN

STRAYHORN - STREAHORN

SUGRUE - SEGRAVE, SUGHRUE, SUGREW

A longer list of variants for Strahan on Irish Ancestors Wizard.

[Formernewyorker]

That’s wonderful information on Ellen. Thanks so much.

[aghadowey]

Trying to follow up this entry-
Roscommon Messenger, 21 May 1910: M'DONNELL V NEVIN. John M'Donnell, Lanesboro’ Road, sought an ejectment the title against Thomas Nevto [Nevin?], Corbo, respect the lands of Corbo, containing 19a 35p [3r 5p more likely]. Mr Maurice Staunton, solicitor, Castlerea, appeared for plaintiff, and M Moran for the Mr ...

Think I found John McDonnell but guess who's his uncle (head of household)- James Shruane!
http://www.census.nationalarchives.ie/pages/1911/Roscommon/Roscommon_Urban/Lanesboro_Street__Ballypheasan_/783871/