I think he is probably the "Henry Gillow" buried at Maughold, March 29, 1914, age 52.

See Brian Lawson's burial index:

GILLOW, Edith 2 mos Maughold 20 Mar 1917
GILLOW, Henry 52 Maughold 29 Mar 1914
GILLOW, James 3 mos Onchan 13 Oct 1849
GILLOW, Robert 69 Maughold 21 Nov 1900

This name is variously mis-transcribed as Gillan, Gillm, Gillen, Gillow...

I didn't find a marriage for Jessie Gillon in the index. Have you sent for the record?

(When you figure out the puzzle, do post it on this board, in case others are looking for the same information.

Good luck!