Can you provide me with some Fantasy writers?

My girlfriend is crazy about fantasy stories.
She is real enthusiastic when she tells me parts of the story of Sylvana from World of Warcraft or books by Tolkien.
In this genre I know nothing about it myself and have no affinity with it too of fantasy stories, can you give me one or more writers that are similar/write similar stuff?
Preferably big names so that there is a chance that I can order their book(s) in Greek assuming that great writers are translated in Greek.
Thanks in advance!