I do not have any info on McNab surname, but I am interested in the McArthur surname.
I noticed you have a family website at ancestry, regarding
Donald McKechnie who was born 1815 in Islay. I am most interested in communicating with you on this family. I do not have a subscription, and can't email you through ancestry.
Could you be so kind as to email me? I have attached a file for you to read.
Thanking you in advance