Hi Jim,
Tawnakeel is a townland in Crossmolina Parish.
I have no Caregan entries, most are Corrigan/Currigan. The person who entered the names into the Church register wrote the names as he heard it, and there is a wide variety of creative spellings for surnames in any parish register. So, the name Caregan and Currigan are the same name, it was not changed. The same registrar could have spelled the same name any number of ways- its amazing how creative they were!
Specifically those in the Tawnakeel townland was a Pat Corrigan and Mary Clarke, (Clark, Clerk...) but at a later date than your are looking for. There was no Tawnakeel listed in 1833 Tithe, but in the Griffiths Valuation (1850)  there was a Patrick Corrigan mentioned in Tawnakeel.
YEAR   MONTH   CHILD   FATHER   SURNAME   MOTHER   SURNAME   RESIDENCE   
1854    June   John   Pat   Corrigan   Mary   Clarke   Tubrid            
1862   June   Mich   Pat   Corrigan   Mary   Clarke   Tawnakeel            
1863   July   Martin   Pat   Corrigan   Mary   Clarke   Cloonkelly            
1868    April   Br   Pat   Corrigan   Mary   Clarke   Tawnakeel            
1856    11-May   Peter   Pat   Corrigan   Mary   Clarke   Tawnakeel
1860    Feb   Pat   Pat   Corrigan   Mary   Clarke               
1853    6-Feb   MARRIAGE Pat   Corrigan   Mary   Clarke
Early Corrigan couples that may possibly be parents to your John :
John Corrigan and Mary Dooher? had William in 1841. I couldnt read the townland.
Pat Corrigan and Catherine Loftus of Letterbrick. They had Patrick in 1846 and Martin in 1850. A Peter age 19 and Patrick age 11, both of Townakeel, attended Letterbrick School in 1873.
Bryan Corrigan and Jane Bourke of Enaghbeg- they had several children, including one in 1845 whose name I could not read. Bryan was living in Enaghbeg in 1833 Tithe records.
Here are all the Corrigan families listed in the Griffith Valuation:
CARROWKEEL   Bryan   Corrigan
CARROWKEEL   Daniel   Corrigan
COOLNABINNIA   Anthony   Corrigan
ENAGH BEG   Mary   Corrigan
TAWNAKEEL   Thomas   Corrigan
On to the Stanton/Staunton info:
We have no townland called Barycostello, but we do have a Rathnacostello.
There were not many Stanton/Staunton christenings or marriages in Crossmolina:
1864    16-Feb   MARRIAGE John   Stanton   Bridget   Corrigan   Rathnacostello
1854    Sept   Laughlin   Malachy   Stanton   Mary   Barrett   
1863   Oct   Malachy   Malachy   Stanton   Mary   Barrett   
1856    30-Dec   Wm   Laughlin   Stanton   Mary   Barrett   Shipe (Killeen)
There were no Stantons in 1833 when the Tithe was done. In 1856 Griffiths Valuation has in Killeen "Tenents of Stanton" but no given name for this person. There were no other Stauntons listed in all of the parish.
Thats all I have for now Jim. Please be aware that the register is difficult to read-pages missing, torn, faded, unreadable, and I may have interpreted the written words wrong, and even though I did the best I could, there are errors. The film is 1279204 from the FHC-you should look at it yourself.
Diane