What is "wilamowiczanie"

Wilamowiczanie or Wilamowianie (, Wymysorys: Wymysiöejyn) are an ethnic group of in Poland living in the town of Wilamowice near Bielsko-Biała, who speak the Wymysorys language and have their own national costume and traditions. The name Wilamowiczanie (singular: wilamowiczanin) is for inhabitants of Wilamowice who identify themselves with the cultural society of Wilamowice. Their traditions say they are descendants of immigrants from Flanders. The overall population of the Wilamowiczanie declined during World War II.