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 400 appr sprewanen Sprewanen over 1600 16 books Sprewanen sprevjane 3 books Sprevjane The same goes for the related Heveller in the same Berlin area Over 200 books Heveller Havolane 2 books Havolane Why are the odd unknown names Sprevjane and Havolane pushed in wikipedia