There is no Wm McKay 1980 buried in Douglas Borough, Braddan, Malew nor in Douglas Crematorium.
My Peel burial only goes to 1979. I'll keep a look out in the other parishes.

In the 1901 IOM Census Index by Brian Lawson
This index does not provide the usual details but note is listed as Corran.
The Robert Corran family is listed in Douglas as
Robert 25
Catherine 25
William 8

Per Brian's Index
CORRAN, Robert Edmund 21 Nov 1897 D bra 713b MC KAY, Catherine Elizabeth

Douglas Borough
Burial Register
CORRAN
Matthew Joseph age 2 buried 18 Jun 1905 grave C 178

Catherine Elizabeth age 63 buried C90 11 Mar 1937 NO STONE