I've always wondered about the band name, and now with Gore coming out I was pondering again. I'm not a native speaker but I think it's 'def', as in the slang word to describe something that's cool or dope, and tones. Cool tones..
As for the album, I'm still warming up to it. I love Deftones, White Pony is one of my all time faves, as is Saturday Night Wrist (severely underrated record). I thought Koi No Yokan was incredibly solid and catchy. The band sounded alive on that one.
Gore on the other hand sounds perhaps more interesting, but it's so weird melodically. It's definitely one of their most out-there records, and for a band like Deftones, that's saying something. In any case, you just have to give them credit for being so adventurous this late in their career. The new record is good, it's challenging and seems like it's there for the long run, instead of instant gratification. Or maybe I just want to like it, I don't know. I can't decide yet.