To start, other than what I just looked up on Google I know very little about Normal culture, however, I can tell you that I have ancestry from Ireland that is well documented, and Norse heritage that is for some reason significantly harder to find anything about (Among other European areas such as France, and Germany). From what I just looked up, I would say that it is quite possible that my background is tied into the Norman culture.
I am interested to hear your theory, care to explain?
Well, I won't hijack this thread so I'll speak more in the coming weeks.
Basically, the Normans (North Men) are desendents of the Viking, They teamed up with the Viking to take Britain from the Anglo Saxons in 1066.
You would likely be Viking, if my theory holds, especially if you can trace back to Dublin Ireland and/or can ascertain your surname as being a Viking derivative. (Almost certain the Normans didn't venture to Ireland)
Anyway, Given that the male Y chromosome stays (reasonably) constant through the generations, I do believe that traits (In males) and so forth also pass down this line..
The Vikings/Normans were seriously a very different breed of people. The more you learn about them, the more you'll see that NTJ "8w7" trait line. (The Castles, The Churches, The Crusades, its all there... it wasn't prissy 5w stuff, Lots of J, Lots of NT... and good old fashioned pillaging

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Image:Vikings-Voyages.png - Wikipedia, the free encyclopedia