I've seen plenty of threads where baby names are described as Goth, maybe not as many as described as Chav, but that's likely to be because Gothy names are much less popular which is a shame.
The problem with the term Chav is that so many people use it for so many different reasons. I know when I first heard it used (a long long time ago) it was only in reference to style of dress, over time the media got a hold of it and it became used to refer to more than just a style of dress.
I agree with TheQueen that there are worse things than being called a Chav.
Also, I know plenty of people who self identify as Chavs, they find it amusing. Possibly because they are aware that to lose the label all they'd have to do is change what they wear. Used to hang around with a hell of a mixed group, Goths, Punks, Indie kids, Chavs; we made a bizarre sight! And we all knew that it was nothing more than a description of how we looked, and therefore not a big deal.