Brain Snacks: Tasty Tidbits of Knowledge
Nope, he's not another British fantasy author… Garth Nix is Australian, even though Ancelstierre seems to be based on England. (Source.)
Yep—Garth Nix is his real name. He's often asked about it because it seems like the perfect name for a fantasy author. (Source.)
According to Nix himself, Sabriel can be pronounced either Sab-ree-elle or Say-bree-elle. So, you know, pick whichever you like best and run with it. (Source.)