Hi Lister To augment what Nick was saying.   When in 1712 the first German were solicited by Duke Karoly to settle in the Sathmar region they were solicited from Schwaben. The name Schwaben would stick. There after all Hungarian landlords wanted to have Schwaben,  since the Schwaben were known as hard working and good farmers. Although the word in Hungary for German is Nemet. The Hungarians and Serbians, however called them Swabo. Or like we "Schwob". One other reason for the relative pur German is the segregation policy of Empress Maria Theresia. She believed that neither ethnic people nor religious people should be intermixed and therefore we see, a Hungarian town, Serbian town and German town speaking their own language and maintain their own cultures and social mores. Naturally there was some mixed marriages but not on a large scale. The Empress also segregated the religions. The Serbian Orthodox, the Hungarian Catholic. The German however, where again settled in Catholic, example Werbass or Schowee. Only after the Hungarian revolution the Hungarians started a assimilation politics after learning that there were less Hungarian in their country then Germans. A census showed the Hungary had a population of only 20% Hungarians, 25% Germans and 45% Slavics, 10% other nationalities. You also need to realize that Hungary used to be a very large country in Europe which had 11 nationality groups and was the only country governed by a minority group. The name Donauschwaben was coined simply to identify all the Germans that settled in Hungary prior to WWI when Hungary lost most of their territory.   The Germans would continue to use "Schwob" to refer to themselves. They did not call themselves Donauschwaben until after WWII. One other thing is to consider, as the population of the Germans in Hungary grew and the available land diminished. Many families moved to settle other parts in the country, therefore several communities now would have a population of German with Serbian or Hungarian sections. Most of the Germans in such communities with such populations would now speak some Hungarian or Serbian and in some cases intermix. This should give you a clear understanding of the "Why" and the "How" as well as the "Where" . Hans