"Dorado" is a Spanish word meaning "gilded" or "golden". It comes from the Spanish word "oro", which means "gold".
"San" is a shortened form of "Santo", meaning "saint" in Spanish. It is often used as part of place names, like San Francisco or San Diego.
So, "Dorado" is just a word meaning "golden", and it doesn't have any connection to "San" in terms of meaning.