I too am looking for McMillans in this area, my gggrandfather was Donald McMillan who married Catherine McPherson, his father was Archibald and he married a Catherine Campbell. Archibald Had three children that I know of Duncan, Donald and a daughter Ann who also married a Mcpherson. My gggrandfather Donald was born in Strontian and the other two in South Knapdale and Arhacle. Does this gel with any information you have.
Thanking you.
Diane