Proprium as a word phrase serves as a denotation of a unique object and its assignation. It is inseparably part of our life. In the study the authoress wanted to show the polarity of the Slovak anthroponymical system. The gradual need to identify and at the same time to differentiate a person led to the enactment of official form of name and this is in the order first name and second name. However, identification needs were not content in full range. The same second name and even the same first name appeared. And so the non-official system was born concurrently. The non-official system is formed by nicknames and living person names, which are known only for definite group of people, i. e. group of certain geographically delimitate area. Although the space for using official and non-official anthroponymical system is different, they cannot be seen in contradiction, but they are identified as living and functioning. In this article the authoress is trying to focus opinions on names (official and non-official) from the philosophical point of view, from the ancient Greek up to the present. In exploring non-official naming system she draws on the methodical concept of V. Blanar and J. Matejcik.