Provençal dialect
The name of the village, as it appeared for the first time in 1147 ("in Sedena"), is thought to refer to the Gallic tribe of the Édenates, or to be built on the root *"Sed-", for rock, according to Charles Rostaing. According to , the name comes from a Pre-Celtic root oronym (mountain toponym), *"Sed-". The municipality is named "Sanha" in the Vivaro-Alpine dialect and Provençal dialect of the , and "Sagno" in the Mistralian norm.