I am Finnish and Swedish on my mother's side, and Polish and Ukranian on my father's. My husband is Irish via Newfoundland on his mother's side, and Acadian, Irish and Basque on his father's side. We both grew up in Ontario and New Brunswick (Canada).
I had to laugh when I read the German-named ladies' "relief" when they got to change their names at marriage. I could have gone from the Polish "alphabet soup" 11-letter last name to the nice easy Irish one, but I didn't. Too lazy to change my credit cards, I guess, plus I had was being awarded my university degree the week after the wedding and had an academic paper in publication, so my big ego wouldn't let me change it.
Actually, at the time, my father didn't know a lot about his family, having been an only child, orphaned at the age of 15, and having his father die when he was only 10. I think I kept my maiden name as a "flag" in case any of the relatives saw it in the phone book or on the net...
My father is now in his 50's and this summer, he and my mother travelled to Poland to meet a cousin who had found our address several years ago. He thought there was just this one cousin, but it turned out he was the youngest of 7 cousins, all with children and grandchildren. In a short amount of time, he went from knowing two cousins on his mother's side and writing letters to one on his father's to having about 60 new relatives!
Great question to start this thread! Everybody's families are interesting, even if you 100%-ers don't think so