Dorado, Spanish for “covered in gold” — think of McDonalds in Spanish. Los Arcos Dorados (the golden arches–literally!) comes from the Latin de– (“of”) and aurum, “gold”: gilded or gold-covered, literally means… from gold.
From the same Latin root we also get the English aurora, “dawn” or the Roman goddess of the dawn. The morning sun glittering in the distance is… shining, just like gold does.
We can see the a-r root in both words clearly!