As is well known that there several elements play role on transformation of place names which bear precious information about history, culture, and the place where speakers of the given language live. Some of these elements are phonetic harmony (Izmir < Smyrna), meaning copying (Krasnoyarsk < Kizyaryar), renaming (Aydin) and wrong semantic transformation (Anadolu, Adilcevaz). One of these transformation types is to use different types of words from a contact/donor language with which is interacted through social, political, or geographic reasons. When any name belonging to the source language is adapted and combined with a new lexic or morphological element of the recipient language, a two-part mixed structure appears. Such structures are covered by the terms hybrid (Lat.), mixed name (Eng.), Mischname (Ger.) and гибридное имя (Rus.). Our study is about these mixed place names. Within the scope of our study is given theoretical knowledge about these structures which can be seen in various types of proper nouns, and several examples from Turkey have been examined. In the conclusion part, melez yeradı, as a new term, is suggested for such structures. The other results of the study are as follows: the fact that a place name consists of two parts each of which belong to different languages are not enough to consider it a hybrid. These parts must reflect different layers in the place name.