Sberna

Sberna is a surname found in the Swiss-Italian and Franco-Provençal regions. It may be of Celtic origin. 
Etymology.
The name is derived from the Celtic word "vern", "gwern" or "berula" ("berle"), meaning "alder tree" or place of alders. The name indicates a Celtic person who lived where alders grew. The etymology seems to be very old and dates back to the time of Gaul, which was inhabited by Celtic tribes.
In the Romansh language spoken in the Cantons of Grisons (Graubünden) and Ticino in Switzerland and in Lombardy (Italy), the word appears as "s'bèrna" and "bèrna", with the accent over the letter "e". Its dialectal meaning is "skinny and ugly" ("magro e brutto" in Italian), indicating that the name derives from a physical appellation of people, although that is only a hypothesis.
The Eastern Alpine dialect is also spoken in parts of Sicily, having been introduced by the Vikings at the time of the Norman Conquest (Viking). According to Gerhard Rohlfs the name derives from a Sicilian word "sberna" which meant "alder" whereas for it means "big cloth cover" (cf. burnous).
Variant forms.
Related surnames are "Vernon" in the English-speaking world, and "Bernaz" in the Chablais.