Русское воеводство
Historical records first mention the river in 1097 as "Sanъ", "reku Sanъ", "k Sanovi"; then as "nad Sanomъ" (1152) and "Sanu" (1287). On the old maps of the Ruthenian Voivodeship, Poland 1339–1772: "San" (1339), San (1372), "Szan" (1406), "Sanok" (1438), "Saan" (1439), "Sayn" (1445), "San" (1467), "Szan" (1517), "Schan" (1526).