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http://www.answers.com/topic/wymysojer
The inhabitants of Wilamowice are thought to be descendants of Dutch, German and Scottish settlers who arrived in Poland in the 13th century. The inhabitants of Wilamowice always refused any connections with Germany and proclaimed their Dutch origins. Wymysojer was the vernacular language of Wilamowice until 1945–1949. After World War II, local communist authorities forbade the use of the language. Despite the fact that the ban was lifted after 1956, Wymysojer has been gradually replaced by Polish, especially amongst the younger generations. At present, there are about 100 native users of Wymysojer, the majority of them elderly people; Wymysojer is therefore an endangered language.