Think you mean William Corkill, not Ewan?
Maughold bapts:
Jane [daur of] William Corkill/ Catharine Kelly Parish Church 14 Sep 1800
Catharine William Corkill/ Catharine Kelly Parish Church 19 Sep 1802
Mary Ann William Corkill/ Catharine Kelly Parish Church 27 Jan 1805
William William Corkill/ Catharine Kelly Parish Church 28 Jun 1807
Robert William Corkill/ Catharine Kelly Parish Church 12 Nov 1811

Other possible Jane Corkills bapt Maughold who fit her age at burial and in censuses (see my previous message):
Jane Illegit daur of Jane Corkill bapt 30 Dec 1798.
Jane daur of William Corkill/Esther Kneale Private baptism 31 Jan 1799.
Jane daur of Thomas Corkill/Margaret Fargher bapt 16 Nov 1800.
Jane daur of Peter Corkill/Ellinor Corkill bapt 12 Apr 1801.

Sue