It's true, we do tend to do that. It is sort of weird, especially because a lot of us have ancestry from so many different countries at this point (I'm a mix of British, Swiss, German, and Norwegian ancestry, and possibly a couple others as well!). I wonder if it's because it influences our family traditions, like certain recipes that are passed down through generations, etc? I'm not really sure! I can definitely see why it might seem odd to other people though!