The article concerns the Luzicka Nisa (Lausitzer Neisse, Nysa Luzycka), which is an important river in Northern Bohemia. The author describes its names and names of its spring rivers from the diachronic and synchronic point of view. There were many variant names for all the streams the article deals with. Synonymy is connected especially with the Bila Nisa river which was also considered as a headstream of the Luzicka Nisa for some time. The author presents 14 names for this river which is only 10 kilometers long. Today's standardized hydronymy puts stress both on unambiguous and unique identification but also on historical and communication aspects.