There's a castle Falkenstein, and my Falkenstein ancestors came over around 1860 or so. I figure they were probably not the proprietors of the Falkenstein lands, merely serfs or something. Why else move to America? Further, my name represents merely the patrilineal ancestry, on branch in a big bush of genetic contributors, which, though all from the Germanic/Swiss areas of Europe, this implies that the 'Falkenstein' branch gets too much credit or blame for my genetic inheritance, as there were Bucholzs, Horstmanns, Boughs, Bylers and lots of other names that are just as much of me genetically. Perhaps, if I'm just trying to feel good about my ancestry, I should pick the most successful branch and emphasize that (eg, my mother's father's mother).
Indeed, the Castle Falkenstein was built around 1280. Assume that the most awesome, smart, sexy, Falkenstein from that period was my direct ancestor. That's about 30 generations ago. 2^30 is the number of parents of my parents etc. at that point, about 536 million people (obviously, this implies lots of incestuous repeats). Even if my father's father's father was The super cool Falkenstein, it's pretty immaterial in my genetic makeup. I'm sure they were lots of losers without castles in that list of 536 million. Thus, in the big scheme of things, I should be concerned about the those 536 million ancestor's allele frequencies which would be less a function of surname, than the geography of my ancestors, which is approximated I suppose my the surname of the, say, 16 great-great-grandparents I know.
So, a surname is probably not nearly as important, genetically, as we presume. But, just for fun, I looked online at my family crest. Interestingly, it seems every family crest website has a different Falkenstein crest. One site lists the German and Jewish version of the Falkenstein crest, the difference being merely the colors. I bet both the Jewish and German side feels the other stole their crest [I'm not Jewish]. I have a suspicion these family crest websites are just making this stuff up.
See different crests here, here, and here.