The only ones that I know for sure are Irish and Italian (both featured on my mother's side). My father's side is a bit of an iffy situation because my dad's dad was born out of wedlock and he doesn't want to talk about his family or ancestry due to embarrassment, I guess. It's understandable but frustrating for me since I would love to do some research on my ancestors. My grandfather seems to not like Jews very much (sad, I know, and I assure you all that I don't share the same sentiments), and I think he might be self-hating if you get my drift.
The few snippets of info I have been able to find out about my dad's side point to the ancestry being mostly Pennsylvania German. But I don't know if that applies to me because it isn't clear whether that heritage is from my grandfather's real dad or from his adopted family. In short, it is a hugely complicated situation, and I sure don't have or understand all the information.