Dutch word gildos comes from Dutch os (Ox (a castrated bull).), Dutch gilde (Guild.)

Detailed word origin of gildos

Dictionary entry	Language	Definition
os	Dutch (nld)	Ox (a castrated bull).
gilde	Dutch (nld)	Guild.
gildos	Dutch (nld)	A decorated ox, (to be) slaughtered for a meal at a guild.