Try clan/tartan finders at these sights:

http://www.clanfinder.scottishthemes...clanfinder.asp

http://www.scotclans.com/index.html

http://www.geocities.com/SoHo/Lofts/6448/ncrlinks.html

http://www.rampantscotland.com/

http://www.tartans.scotland.net/