All I can suggest is you look at this list of cities/places with name changes and see if yours is there, though there doesn't seem to be much for Slovenia, but it was the most westernised of the Yugoslav states...

http://www.pcgn.org.uk/Place%20Names%20in%20Countries%20of%20the%20Former%20Yugoslavia%20-%20May%201999.pdf

You could also try asking on tripadvisor.com - there are people posting there who live in these countries who may well have more information for you.

Good luck!

Jill:
In my FEEHS files I found two way-outside possibilities of Parishes in Slovenia, 1900, when it was part of the Austro-Hungarian Empire:

Zuzemberk ... Zuzemberk ...near Ljubljana
(tzsoozemberk)

and

Cirknica ... Cirknica ... also near Ljubljana

Here is the whole file.

http://www.feefhs.org/links/Slovenia/1900parishes.html

(Federation of Eastern Europeam Family History Societes)

Here is a 1908 map of the southern part of the Austro-Hungarian Empire which inluded most of later-to-become Yugoslavia...Carniola was the name for what was later to become Slovenian Region of the new Yugolsavia..and then independent Slovenia after the 1990's war. I saw nothing on the map to indicate Circumsa or sounds-like, but the map is not a detailed one.
http://www.feefhs.org/maplibrary/harmsworth/harm70m.html
If you contact FEEHS, they may help with much more detail.

Stu Tower