"Variant of Gildard"
The name Gildardo is commonly a male name from the "Spanish" origin.
Gildardo is the Spanish form of Gildard, a name recorded in Latin as Gildardus. It is a saint's name: Gildardus was bishop of Rouen in the sixth century and is venerated in the Catholic Church, and the French form of the name is Gildard. Spanish adds the final -o that is usual for masculine given names in that language.
The pronunciation of Gildardo is gil-DAR-doh.