What does silverado mean?

Actually, I want to rephrase this question.

What is the meaning of the "ado" suffix? Does it mean something in Spanish? There are several locations that seem to have this ending.

Colorado -- means colored red.

Eldorado -- City of gold.

Silverado -- I can guess, but the pattern doesn't seem to fit.

I would think that Colorado could be broken into two parts "color" and "ado". The most likely meaning of those two respective parts is "color" and "red". Which would make "eldor" + "ado" = gold + red. And likewise, "silver" + "ado" = silver + red.

The other theory would be that "color" = red and "ado" = colored. I think this is unlikely, but this pattern logic kinda fits. Then "eldor" + "ado" = gold colored (if eldor actually means gold) and "silver" + "ado" = silver colored.

I hope this makes sense. Thanks for any help.

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Just improvind the answer:

The suffix "ado" in Spanish is the same of "ed" in English.

in the past participle of "to colo" "colored", in spanish the past participle of "color" is "Colorado"

"dorar" means "to gild"; "dorado" means "gilded"

"El" means "The" => "El dorado" means "the gilded"

"Silverado" is a 2 languages mixed Word that resembles "El dorado", refering to the ore of silver instead of gold. The spanish Word to cover of silver is "Plateado"