I have been very interested in my ancestry, genealogy and my heritage for a very long time, specifically my Scottish ancestry as that is primarily my love (my last name is decidedly Scottish.
I know I have a lot of German in me as well, and even have that genealogy traced all the way back to Germany. I know there is English as well.
One way of doing it is to spend the time to actually do all the genealogical tracings. The quicker way to get an idea of where I come from is to see what the DNA markers say.
My wife had done the Ancestry DNA a couple of years ago, and I thought it was interesting how they would update her stuff quarterly to better reflect the research they are doing and what they have found on where the markers tie into places of the world and the people that came from those places.
I broke down about 6 months ago and got the kit myself and sent it in. I was rather shocked at my results. I did see the Scottish and German, but also England and France (which was not unexpected. There was also Denmark, Sweden and a small amount of Norway. The most surprising one, though, was the appearance of 1% North Africa. THAT had me digging to understand it and found that a major study had been done into it and found that 1% of the Scottish population has that same marker and it ties to the nomadic Berber and Taureg groups. I thought that was pretty freaking cool!
Then came the first quarterly update. The Sweden, Denmark and Norway got lumped into a group called Germanic Europe...and into the Scottish due to the Viking invasions. Spain made an appearance at 2% (WTH?)....and the 1% North Africa stayed.
Even though the DNA test says I am only 11% Scottish, due to my last name, I claim it a lot more than any of the rest (even though my wife says I need to get some Lederhosen) and I own all the items for full Scottish dress, from casual to full formal.
Overall, I think it is neat, and my wife and I have a lot of fun with it. It is interesting to me to see where I come from...the good and the bad. (My surname has a pretty nasty reputation in Scotland...so much so that there are places where we still aren't really welcome to this day.)