This paper discusses declension patterns and their application to selected oikonyms of Split-Dalmatia County. It also talks about the creative methods used in the formation of the demonyms and ktetic forms from the selected oikonyms of the Split-Dalmatia County. In the first part of the paper, a theoretical insight into the development of the study of these linguistic phenomena is presented, which is imbued with an onomastic and normative approach. 71 respondents participated in the test. The first group consisted of respondents whose place of residence is in Split-Dalmatia County, the second group consisted of respondents from other counties in the Republic of Croatia. Based on a questionnaire that consisted of 19 tasks, the knowledge of the declension of oikonyms and the formation of male and female demonyms and ktetics was tested. Also was tested the extent to which speakers of the Croatian language, to whom these oikonyms are spatially close, have difficulties in determining the grammatical categories of gender, number and declination type of oikonyms and the formation of demonyms and ktetics.Selected oykonms from the Split-Dalmatia County belong to different declension types and differ in terms of referentiality, clarity of appellative and complexity (single and multi-word oikonyms). The first part of analysis of the results included the declension of the selected oykonyms which were grouped according to gender, number and declension. In the second part were analyzed word-formation types used in the formation of male and female demonyms and ktetics. The purpose of this paper was to establish to what extent the given rules on the declension of oikonyms and the formation of demonyms and ketic forms are applied, and which factors affect their compliance with the norm. The presented results show that there are still many uncertainties and doubts about their use.

U ovome radu riječ je o ovladanosti sklonidbom ojkonima te tvorbom etnika i ktetika na primjeru odabranih ojkonima u Splitsko-dalmatinskoj županiji te od njih izvedenih etnika i ktetika. U prvome dijelu rada dan je kratak pregled istraživanja ojkonima, etnika i ktetika, njihovo određenje te posebnosti u sklonidbi i tvorbi. U drugome dijelu rada predstavljeno je provedeno istraživanje. U ispitivanju je sudjelovao 71 ispitanik. Prvu skupinu činili su ispitanici čije je boravište/prebivalište u Splitsko-dalmatinskoj županiji, drugu skupinu činili su ispitanici iz ostalih županija u Republici Hrvatskoj. Na temelju anketnoga upitnika koji se sastojao od 19 zadataka provjeravalo se poznavanje sklonidbe ojkonima, tvorbe muškoga i ženskoga etnika i tvorbe ktetika te se ispitivalo koliko govornici hrvatskoga jezika, kojima su ti ojkonimi prostorno bliski, imaju poteškoća s određenjem gramatičkih kategorija roda, broja i sklonidbene vrste ojkonima te tvorbom etnika i ktetika. Odabrano je 19 ojkonima iz Splitsko-dalmatinske županije, koji pripadaju različitim sklonidbenim vrstama i koji se razlikuju i prema referentnosti, jasnoći apelativa te složenosti (višečlani i jednočlani ojkonimi). Prvi dio raščlambe rezultata obuhvaćao je sklonidbu odabranih ojkonima koji su grupirani prema rodu, broju i sklonidbi. U drugome dijelu raščlanili su se tvorbeni načini kojima su ispitanici tvorili muške i ženske etnike te ktetike. Cilj ovoga rada bio je utvrditi u kolikoj se mjeri primjenjuju normativna pravila o sklonidbi ojkonima i tvorbi etnika i ktetika, odnosno u kolikoj su mjeri ispitanici ovladali normom. Rezultati upitnika pokazuju da i dalje ima nesigurnosti i poteškoća u njihovoj uporabi.