Mary, looking again at these records, I think that the William (no "E") son of Robert Corkill & Mary bapt in the Maughold Parish Church on 15 Feb 1852 would have been the son of Mary Clague, not Mary Skillicorn. I can't see a reason why the Lonan family would suddenly have a child bapt in Maughold. Robert Corkill & Mary Clague married in Maughold on 13 Jan 1844.
This is the Maughold family:
1861 census Household transcript by Findmypast:
Name Relation Condition Se x Age Birth Year Occupation Where born
CORKHILL, John Head Married M 64 1797 Farmer Maughold, Isle of Man
CORKHILL, Elinor Wife Married F 67 1794 Maughold, Isle of Man
CORKHILL, Robert Son Married M 40 1821 Labourer Maughold, Isle of Man
CORKHILL, Mary Daughter In Law Married F 43 1818 Maughold, Isle of Man [Assume CLAGUE]
CORKHILL, Thomas Son Unmarried M 14 1847 Maughold, Isle of Man
CORKHILL, William Son Unmarried M 10 1851 Maughold, Isle of Man
CORKHILL, Edward Son Unmarried M 7 1854 Maughold, Isle of Man
CORKHILL, Mary Daughter Unmarried F 5 1856 Maughold, Isle of Man
CORKHILL, Margaret Daughter Unmarried F 4 1857 Maughold, Isle of Man
Piece: 4425
Folio: 30
Page: 13
Registration District: Isle of Man
Civil Parish: Maughold
Municipal Borough:
Address: Bowelerelt, Maughold
County: Isle of Man
This is the Lonan family:
1861 census Household transcript by Findmypast:
Name Relation Condition Se x Age Birth Year Occupation Where born
CORKILL, Robert Head Married M 30 1831 Miner Lonan, Isle of Man
CORKILL, Mary Wife Married F 34 1827 Lonan, Isle of Man [Assume SKILLICORN]
CORKILL, Robert J Son M 11 1850 Scholar Lonan, Isle of Man
CORKILL, Jane Daughter F 9 1852 Scholar Lonan, Isle of Man
CORKILL, John J Son M 6 1855 Scholar Lonan, Isle of Man
CORKILL, William E Son M 4 1857 Scholar Lonan, Isle of Man
CORKILL, Thomas H Son M 2 1859 Lonan, Isle of Man
CORKILL, George Son M 0 (6M) 1861 Lonan, Isle of Man
Piece: 4423
Folio: 16
Page: 25
Registration District: Isle of Man
Civil Parish: Kirk Lonan
Municipal Borough:
Address: 5, Laxey Mines, Kirk Lonan, Abbey
County: Isle of Man
Sue