Thanks for mentioning the sources you've tried - saves a lot of work!
I tried www/rootsireland.ie/ but no luck with baptism, parents' marriage or deaths I'm afraid
I tried a cd I have Memorials of the Dead Galway & Mayo but none there either.
The Tithe Applotments (free at http://titheapplotmentbooks.nationalarchives.ie/) have a James Newell in Galway in 1829: townland Raha, parish Kilcummin
There are 4 Whalans but all in Carlow.
Regrettably, the R C registers at the Nat Library of Ireland (free online) have Quansboro baptisms & marriages but they only start in 1891 & 94 respectively
If perchance they were C of I, according to the list of Parish Registers on the Representative Church Body Library's website, the Fahy parish BDM records are held locally (Fahy) but doesn't give the years available or which they have (B,D &/or M
There are 4 Newells in the 1821 Irish Census in Galway - all in Athenry http://www.census.nationalarchives.ie/ (but no James); no Whalans in any county
Sorry I couldn't crack it for you!