There is a book out called the "Weir Sept of Lochiel"
by George D. Weir.
It has the descendants of John Weir and Catherine Cameron.
Mary Margaret Weir is a granddaughter of John and Catherine
and she was married to my(2nd cousin 2x removed,Ronald Martin Emberg.Their descendants can be seen in my tree.See link below.
There are 15 pages on this couple(including some pictures)
and I believe there are still Emberg descendants in the area.