where are the oaks?

Growing up in the Bay Area, I've heard the name 'Oakland' my entire life. There are the Oakland A's, the Oakland Raiders, etc. Unlike nearby Walnut Creek, which makes me think of walnuts, I've always thought of Oakland as one word, not really breaking it down into the two words 'Oak' and 'land.' Does anybody really think of Oakland as land of the oaks? Unless you travel up into the hills, where are all the oaks? I can't help but imagine what the area looked like when the name Oakland was first bestowed upon it. It must have been beautiful.