During Saturday's Pottermore presentation at A Celebration of Harry Potter, author J.K. Rowling recorded three audio segments about her character Gilderoy Lockhart, focusing on his mother, his Hogwarts House and love of hair care products. Those clips, as well as highlights from the panel including a sneak peek from Goblet of Fire's chapter 36, can be found here.

Quote:
J.K. Rowling: Gilderoy Lockart was the only child in his family who showed any magical abilities, so he was very proud of himself in going off to Hogwarts. He was Sorted into Ravenclaw, though I suspect - I think people will be unsurprised to hear that he narrowly escaped Slytherin. But he scraped into Ravenclaw.

Gilderoy is a modern kind of celebrity in the way that he likes to think of new ways to make himself famous. So he decided to put a range of hair-care products out onto the market, he's very proud of his naturally-wavy hair. So, I liked to imagine that he discovered the luster giving properties of occamy eggs, and occamy eggs come from quite a vicious creature - the eggs have silver shells. These shampoos were found to be too dangerous and too expensive to produce, so Gilderoy never pursued that ambition.

Gilderoy Lockhart isn't his pseudonym, Gilderoy Lockhart is his name. I think that says something about his mother, who was very ambitious for her son, and it encouraged him the belief that he was a remarkable person. Gilderoy's quite a flashy name, I think.