Considering the current rise of "ori" names (at least, where I am), I'm surprised at the silence...this is easily my favorite O name for a girl! Orinda flows so nicely off of the tongue, and sounds very stately.
Orinda Dale Evans is an American former judge. She is an inactive Senior United States District Judge of the United States District Court for the Northern District of Georgia.
I've seen this name listed in various sites as meaning "fire serpent" in Teutonic, though most of them seem to be repeating each other and I have no idea whether whatever original source they were drawing on is accurate.