|Jenna Von Oy, who played teenager Six in 90's show 'Blossom'|
Perhaps most significantly, the number 666 is popularly recognised as being "The Number of the Beast", and therefore a symbol of the Devil. It features prominently in many apocalyptic theories and is often used as a reference in pop culture to convey a sense of ominousity and sinister happenings. One such TV show is ABC's new '666 Park Avenue'. The show stars Australian actress Rachel Taylor and Terry O'Quinn (famous for his role as the obsessive Locke in 'Lost'), and is basically about people selling their souls to the devil to make their dreams come true, a notion popularly associated with this symbol. To be honest though, I'm not sure that you would even be allowed by most governments to name your child 666, even if you would want to go with such an extreme moniker.
The much simpler Six however is not totally outrageous, or for that matter out of the question. Back in the early 90's, Jenna Von Oy played the fast talking teenager Six LeMeure on the hit show 'Blossom'. Almost everyone knew who Six was. The show made Joey Lawrence a star, but was based around teen girl Blossom (played by Mayim Bialik, now starring in the hugely successful 'Big Bang Theory') and her best friend Six. Both were lovable if not slightly daggy, and often misguided. The character of Six reportedly got her name because she was - funnily enough - the sixth child in the family. Between the two names of Blossom and Six, this was one of the first shows that made young girls start to dream of one day using different and unusual names for their future children. Or maybe that was just me.
Six has a lot going for it other than its Halloween connections. It is also a pretty special number in mathematics, music (for example, a guitar has six strings), Judaism, Islam, science, sports, and astronomy. The Chinese consider it to be a very lucky number. In fact, it's hard to find an area where 6 does not have some significance. This could make it a great middle name to remember or signify something special in your lives, such as a shared memory or something your hold dear. It even has that cool "x" sound.
Having said all that though, I'm not sure that I'd highly recommend using Six as a first name. Especially in you live in New Zealand, where the accent makes it sound like a different word entirely to the rest of us. And please don't give it to your sixth child, the way poor Six's parent did on 'Blossom'. It just shows you don't care enough to think of something more inspired.