Did you know that in Scotland, the Haggart families were connected to Clan Ross, and were called a sept of Clan Ross?
Clan Ross Association US has a free message board where you can post your ancestral info and questions for others to see and respond to. The site has archives and a search function.
Why not post a message, then check back from time to time to see what others are posting as well? Someone out there may be looking for you!
Go to www.clanrossassociation.org/USA.htm
and click on the "message board" tab.
See you there?