 The main tributaries of the Savinja are the Jušef and the Klobaša at Solčava, the Lučnica at Luče, the Ljubnica at Ljubno, the Dreta at Nazarje, the Paka at Šmartno ob Paki, and the Ložnica and Voglajna with the Hudinja at Celje.The quality of water is first-class to Radmirje, then it falls to second class and after to third.The name "Savinja" (attested in written sources in 980 as "Sovuina") is derived from "*Savьn′a", in turn derived from the hydronym "Sava", of which it is a tributary.