Hi
The marriage entry has William as from Melvaig and Christy from Altgrishan.
This might be them on the 1841 census for Gairloch:
Altgrishan
William McKenzie, 30, herd
Christy, 28
Murdo, 3
John, 2
Father might be a Murdo if they went by trad naming.
If he lived and died in Scotland, his death cert would give his parent's names.
Gadget