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Also, Elizabeth Mantach's baptism in 1770 describes her father as "James Mantach, Curshalloch"  and the 1773 Margaret's baptism also describes her father as "James Mantach, Curshalloch" which tends to confirm that they were sisters!

Elizabeth Mantach was my  5 x gt grandmother. 

I've just rechecked and have their marriage:

Jan 6 1849 - Murdo McKenzie in Mellon Udrigill and Eliza McLeod in Altantarsin.

I am really struggling with Murdoch / Murdo MacKenzie.  The family were at Ormiscaig in both 1861 and 1871.   He is described as "Murdo MacKenzie,  48,  Crofter of 4 ½ acres,  born Gairloch"  in 1861 and as  "Murdoch McKenzie,  60,  Crofter,  born Mellon Charles" in 1871.

His wife (Elisabeth, aged 44, in 1861 and Elizabeth, aged 50, in 1871) is more straightforward - she was baptised Elispet on 18 July 1821, parents Murdo McLeod and Mary MacKenzie, Mellon Udrigle.  She died (name given as Eliza) 16 June 1910, aged 88, at Balnaluib, widow of Murdo MacKenzie, crofter, parents Murdo McLeod, crofter and Mary MacKenzie. 

Murdo / Murdoch MacKenzie and Elispet/ Elisabeth / Elizabeth / Eliza McLeod had seven children,  all born in the parish of Gairloch.  Two, Hector and Isabella (Bella)  went to Glasgow, married and raised families there.  A third, Murdo / Murdoch was the informant on his mother's death certificate.

I cannot find them on the 1841 or 1851 census returns, under any combination of names, and I would be very grateful to know if anyone else researching MacKenzies in this area  had come across this family. 

Also, to add - James Milton was described as a master blacksmith on Margaret Milton's death cert, and as a blacksmith on Ann Milton's death cert.  If James Milton, husband of Janet Wilson, was described as a blacksmith on any of the death certs of their children, that might help confirm that it was the same person.