Polls in the USA often include breakdowns by race, but this is the first one I've seen break it down by European ancestry. From BuzzFeed:
https://www.buzzfeed.com/peteraldhou...the-white-vote
The article didn't include every ancestry they asked for, or that was volunteered, but they did include raw data, so I did a little tallying of my own. Here's a more complete list, ranked from most Trump support to most Clinton support:
German: Clinton 33%, Trump 51% (Trump +18)
American: Clinton 33%, Trump 50% (Trump +17)
Swedish: Clinton 33%, Trump 48% (Trump +15)*
Italian: Clinton 33%, Trump 44% (Trump +11)
Polish: Clinton 35%, Trump 44% (Trump +9)
Dutch: Clinton 34%, Trump 41% (Trump +7)*
English: Clinton 37%, Trump 43% (Trump +6)
Irish: Clinton 39%, Trump 40% (Trump +1)
French: Clinton 35%, Trump 35% (even)*
Norwegian: Clinton 37%, Trump 37% (even)*
Scottish: Clinton 41%, Trump 38% (Clinton +3)
Danish: Clinton 45%, Trump 27% (Clinton +18)*
Greek: Clinton 47%, Trump 12% (Clinton +35)*
Russian: Clinton 67%, Trump 29% (Clinton +38)*
*small sample size (<100)