The trouble with using unusual surnames in fiction is that they're real, and they belong to very specific people. I guess it isn't a big deal though.
All the names I can think of off the top of my head, are common.
You could browse this list: https://en.wikipedia.org/wiki/List_of_Scottish_clansThere are some unusual surnames there, that don't sound too strange and would flow, such as Whitelaw and Fairlie.
This message was edited by the author on May 5, 2015 at 12:14 PM