Gasto

Old Germanic form of GASTON.

GASTON   male   French
Possibly from a Germanic name derived from the element gast meaning "stranger, guest". This is the usual French name for Saint Vedastus, called Vaast in Flemish, and alternatively the name may be connected to it. The name was also borne by several counts of Foix-Béarn, beginning in the 13th century.
OTHER FORMS
FRENCH: Gaston
ITALIAN: Gastone
SPANISH: Gastón