Contemporary onomastics made progress in interpretation of proper nouns, especially in conception of proper name that is viewed semiotically as a linguistic sign sui generis. Proper noun represents relevant onymic system. Study of onymic sign content enables more exact placing of ethnonyms (folk-names) and nouns denoting persons according to their place of abode into transitory area between common noun and proper noun (close to common noun). Stur's conception of proper noun as a separate thing of a certain class is significant for analysis of this lexical layer. In the contrary to antic tradition of the period, Benolak and Stur took into consideration also place of the folk-names and names denoting persons according to their place of abode. Conclusions of their considerations are not identical, but the fact, that both of them explained this question in relation particular - general (common noun), not particular - individual (proper noun), is motivating.