Olše was not invented by Czech nationalists. It was invented by Polish teachers from Galicia who came to teach on the newly established Polish high school in Teschen (established in 1895) and thought Olza is not Polish enough. (Other names suggested by these teachers were Olszawa (Olšava in old Czech maps), etc.) I really start to get annoyed by the nationalistic rubbish you keep on inserting here, Darwinek!