Thank you very much, Lauren,
I finally got around to joining Clan MacNaughton this afternoon. My family has helped man the MacNaughton tent at the Southern Maryland Celtic Festival and the Anne Arundel County Scottish Festival for a couple of years now, but no one there can tell me the precise connection between the Hendrys and the MacNaughtons. Me thinks it has something to do with "Bog Henry, son of Nechtan", the old Pictish king. But I'm not sure. I will try to keep looking.
Are you affiliated with the clan?