There is already a node for the square (https://www.openstreetmap.org/node/7395129131), so it's better to use it and not put square names on roads (imho).

15-ти ноември officially reaches up to Шипка but I've extended it north to the next proper street since it seemed logical (https://www.openstreetmap.org/changeset/147453861).

Looking at the plans (https://www.facebook.com/photo?fbid=833275225471833&set=a.225573536242008) there is Oborishte Str. to the west of the square. The whole pedestrian area around the cathedral is marked as a square with the same name. The road is unnamed. BNT refer to it as "the east arc of the square" (https://bntnews.bg/news/chast-ot-ulica-oborishte-v-sofiya-stava-peshehodna-zona-1255949news.html).

Maybe we should convert the place=square node to an area and add noname=yes to the roads?