The contribution deals with the transonymisation of propria which is explored on Czech oikonyms exemplified in SYN2005 corpus. It proceeds from the current conception of transonymisation, extending it by a type of co-called “multiverbal transonymisation”, which is a frequent case in transonymisation of oikonyms to chrematonyms, e.g. Brno - Kometa Brno. It describes the factors influencing the process of transonymisation of oikonyms which can be divided into an out-of- language and language categories. Part of the contribution is dedicated to the morfological aspect of chrematonyms. The SYN2005 corpus material was used to describe development trends in the choice of endings in paradigms of chrematonyms created by transonymisation of oikonyms.