Heather is hardly a "made up" name or rebelling. One of my aunts is called Heather and must be well into her late 60 or early 70's by now and was quite common over here.

Of course there was also Rolan Bolan - Marc's son, and Zowie Bowie - David's son. Am I right in thinking that many of these children of celbrities with names like this have converted to 'normal' names.