Off topic a little while, stumbled across an interesting stone name in a book today called Girasol, which is also called the Fire Opal. See, many have been debating on what gem will grace the title of a possible D/P third game followup, and most believe it will center around the ghost dragon Giratina.
Seems quite possible that Giratina is named after Girasol, like how Dialga and Palkia are named after Diamond and Pearl. Since Girasol is also an Opal, chances are the 3rd game will be called Opal, unless Gamefreak decided to teach the hard vocab Girasol to kids. Just a thought though, NOT official.