Hi A_SP, the old looking stone plaques say "Borgo Andrea Costa", but the housenumber plaques, undoubtedly more recent, say "Via Andrea Costa". On the web it is possible to find numerous sources that support the fact that the current name is "Via Andrea Costa", for example the municipal street directory (https://www.comune.portosangiorgio.fm.it/it/2083) or the provincial archives of Italian Revenue Agency (https://www.agenziaentrate.gov.it/portale/web/guest/software-docfa-4005)