It's called Pennsylvania Dutch, but the name is just a corruption of Deutsch.
And note how close Dutch is genetically to German any way. In order of similarness, German to Dutch to Friesian to (Anglo-Saxon, Old Eng) Modern English, then on to Sissy Spaceck and finally Kevin Bacon. All belong (except those last two ) to the "West Germanic" branch of the Proto-Germanic branch of the Indo-European super family. Strip the Franco-Latin from English (i.e. consult some Anglo-Saxon manuscript) and then look at Friesian; marvel at their mutual comprehensibility. I love to see Freshman students' eyes go wide with incedulity when they first see or hear Old English (basically weird German or Dutch). "Uh, I thought Old English was, like, Shakespeare and stuff!).
Oh, I love this. But, incidentally, I'm off to teach my Turkish student American English phonology. I'll be back soon with all you ever wanted to know about Finno-Uralic/Ural-Altaic languages(of which Turkish is one) but were afraid to ask.
Ic wille wessen bæk.