Hi Ken,

I don't think I've looked at him before, but the closest I can see in Maughold baptisms is:
William son of William Corkill & Jane Kneale bapt 26 Apr 1801.

William Corkill & Jane Kneale married in Maughold on 25 Mar 1797.

Other children bapt:
CORKILL Margaret [daur of] William Corkill/ Jane Kneal [bapt] Parish Church 24 Dec 1797
CORKILL Robin William Corkill/ Jane Kneal Parish Church 30 Nov 1806
CORKILL Jane William Corkill/ Jane Kneale Parish Church 24 Oct 1802
CORKILL John William Corkill/ Jane Kneale Parish Church 30 Sep 1804
CORKILL Ann William Corkill/ Jane Kneale Parish Church 14 May 1809
[There might be others with different spellings for the parents, or with the mother just given as 'Jane'.]

Do Australian records of William's marriage and/or death give more information about how long in Australia, IOM address, etc?

Sue