The study deals with the transonymisation - transfer of an already existing proper name into a new onymic class - climbing-path names. The orohodonyms (climbing-path names) identify the vertical lines of the parts of rocks which serve for climbing purposes. The authors and the users of the proper names are climbers; they are therefore referred to as sociolect orohodonyms (socioorohodonyms). The already existing proper names influence the formation of climbing roadnames. In the investigated field of rockclimbing, orohodonyms come into existence by transonymisation of anthroponyms (personal proper names), zoonyms (animal proper names), toponyms (oikonyms 'proper name for the inhabited area' and anoikonyms 'proper name for the uninhabited area') and chrematonyms (proper name for objects which are the result of human activity and have been naturalized in economical, political and cultural relations). The terms of antroponymic origin are most frequent.