I checked Slovenian white pages for your surnames and there are 13 Šubic individuals13 in Žiri area and 18 Demšar's. But there are no Mezgec's from Ziri. I am not sure what the other part of the place would be- Hotenia. Vital books for Žiri are located at Ljubljana's Archdiocese's archive and range from 1738-1906. If you need any other help, you can contact me.