As you have the birth month for him as June this certainly makes my guess more likely.

These are their children baptised in Maughold, from the parish register:

CORKILL Jane (daur of) Robert Corkill/ Cath Quayle Parish Church 1 Jan 1840
CORKILL Esther Robert Corkill/ Cath Quayle Parish Church 14 Mar 1842
CORKILL Robert Robert Corkill/ Cath Quayle Parish Church 30 Jun 1844
CORKILL Cath Ann Robert Corkill/ Cath Quayle Parish Church 25 Nov 1846
CORKILL Elinor Robert Corkill/ Catharine Quayle Parish Church 28 Aug 1854
CORKILL Edward Robert Corkill/ Catherine Quayle Parish Church 8 Mar 1857
CORKILL Isab Margt Robert Corkill/ Cath Quayle Parish Church 22 Jan 1860

There are others where the mother's name is given as "Cathe" or Catherine without a surname, and who could be from this family. They could be sorted out from the censuses.

Looking at the 1861 census, this looks like John:
CORKILL John Robert Corkill/ Cathe Parish Church 8 Apr 1849
and this looks like Ann:
CORKILL Ann Robert Corkill/ Catherine Parish Church 3 Aug 1851.

There was another couple Robert Corkill & Cathe or Catherine having children baptised at the same time, as well as Robert Corkill and Catherine Corkill, and Robert Corkill and Cath Kermeen.

Sue