The names are Sprewanen and Heveller   why Sprevjane and Havolane in Wikipedia  The overwhelming majority of google search results and books show Sprewanen for a former  tribe in Berlin area   Sprevjane   appr  Sprewanen over       books Sprewanen  httpbooksgooglecombooksqsprevjanebtnGSearchBooksasbrr  sprevjane   books Sprevjane   The same goes for the related Heveller in the same Berlin area  Over  books Heveller   Havolane httpbooksgooglecombooksqhavolanebtnGSearchBooksasbrr  books Havolane  Why are the odd unknown names Sprevjane and Havolane pushed in wikipedia