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Hi Urachan, always more questions, I reckon I have proved it to myself by crossing info from 4 or 5 sources to be fairly sure of the the Archi Cranachan line. I can send it to you when I get it a bit more toghether. I found stuff in the Monaro stuff a bit wrong too. 
Why do you think they were called Drochaid - bridge  

My Archibald McDonald b: 1785 Moidart married Margaret Ross McDonald 
is your Mary Drochaid his daughter ?
Dixi

Here is a family line that made sense to me, in brief, and includes the Drochoids and Archibald McDonald

*Donald Macdonell the 1st of Aberarder
Son - Angus  Cranachan  MacDonald 
*Angus Cranachan MacDonald the 1st of Cranachan
Son - Donald (Cranachan) MacDonald  - born 1700
*Donald Cranachan MacDonald the 2nd of Cranachan
 (Son 1 Donald McDonald born 1721 died, later child named Donald) 
Son - Donald MacDonald born 1740
*Donald McDonald
Born: 1740 Cranachan   
Death: unknown Moidart?
Married: 1770 Mary McDonald born about 1745
Children
1.   Angus Mor Drochoid Mcdonald b: 1770 father of Father Coll
2.   Donald Drochoid Mcdonald b: 1773 Mary MacKillops Grandfather
3.   Ian/John Gorm Mcdonald b: 1777
4.   Catherine McDonald of Cranachan
5.   Angus Mor Inch McDonald b: 1780
6.   Archibald McDonald b: 1785 Moidart 
7.   Mary McDonald b: 1787 – married Mr Cameron
8.   John McDonald b: about 1801 in Knoydart
There is a big age gap between the first 4 children and the last 4 children, maybe his wife had 8 children over 33 years, or he took a 2nd wife and is mother of last 4 children. The family left Roybridge area Cranachan.  Inch Gorm and Moidart references could mean the family were moving around due to Clearances?   
*Archibald McDonald  - all family immigrated to Australia 1837 to Monaro
Born: 1785 Moidart
Death: 16 Apr 1872 in Burra near Queanbeyan
Burial: Queanbeyan Riverside Cemetery  -old Catholic section
Occupation: General dealer / farmer
Married: Margaret Ross McDonald in 1813 in  Isle of Skye.
Born: 1793 in Glenfinnan, Kilmallie, Fort William, Inverness, Scotland.
Died: 10 Mar 1861 in Glengaroon, NSW of Afflection of the chest
Buried: 13 Mar 1861 St. John's Church of England, Queanbeyan
Note: Maiden name registered as "McDonald".
Father: Alexander McDonald 
Mother: Margaret Ross
Children
1.   Unnamed McDonald – died before sailed to Australia
2.   Catherine McDonald b: 1818 in Loch Hourn – married Kenneth McDonald of Glengarve, Rothshire at Glenelg 1834. 
3.   Alexander “Sandy” MCDONALD b: 1820 in Loch Hourn
4.   Donald MCDONALD b: 1821 in Loch Hourn
5.   Mary MCDONALD b: 1823 in Loch Hourn
6.   Margaret MCDONALD b: 1828 in Loch Hourn
Married 13 March 1878 to Charles Campbell Cameron
7.   John MCDONALD b: 12 Nov 1830 in Invernesshire
8.   Colin MCDONALD b: 1832 in Invernesshire
(one of the daughters married a James Moore)
Archibald said to have bought a farm in Glenelg Loch Hourn about 1815 and sold it to pay for fares to Australia
All children seem to be born at Glenelg Loch Hourn

Archibald and wife Margaret married Skye 1813 said to have purchased a farm in Glenelg Loch Hourn and had 8 children. Archibald is brother to Mary MacKillops Grandfather.
Archibald and entire family migrated to Australia in 1837. I am looking for farm?