EN
On the example of the Prague urbanonymy, the paper analyses the formation of street names derived from toponyms. It has been shown that not all names of the analysed category are derived using the most usual suffix -ská and its variants. Also the suffixes -ná, -ní, -ová and -ova are occasionally used in the formation of detoponymic urbanonyms. A number of urbanonyms is derived from toponyms by a zero suffix. Some street names have been formed using irregural, unusual means of derivation. Besides the suffixation, also composition of urbanonyms is devoted some attention in the paper. The use of prefixation (combined with derivation) is rare in the analysed material, as well as the creation of multiple-word names.