An analysis of the Hume DNA Project has provided conclusive evidence that the Scottish philosopher, historian and economist David Hume (1711-1776) belonged to haplogroup R1a-CTS4179. This subclade is the most common Scottish variety of R1a. It is belived to have come from Norway with the Vikings. David Hume was one of the fathers of the Scottish Enlightenment and one of the leading Empiricist philosophers.

http://www.eupedia.com/forum/threads/30143-Philosopher-David-Hume-belonged-to-Y-haplogroup-R1a-L448