The name:it is a tag to store the name of the POI (in this case a toponym) when speaking in Italian.
It could be present even if the name used in Italian is the same as the Slovenian.
And it is actually better if it is present even if it the same name (otherwise there would be no way to understand if the tag name:it is missing because the information is missing or because the name is the same).
I do not know the area at all. What I written is just the only way to have the name:<lang> to work