@Carolina925I think with any kind of company where the name of the company is a person, we can assume that once the company grows there are lots of people involved. The name gives respect to the founder and adds to the marketing value.
It's not QVC, but think FORD as an example - is there a member of the original family still involved in the business? I have no idea, but the name evokes memory of the family, of the history of the company, etc. and they are not about to lose that name.
The business model at QVC can make us think Susan or Louis or Isaac or whoever is the only designer for that line, but I don't think that's the way it works. All of those companies produce and market lots of product and employ many. We know the name and the face because they appear in front of us, so we know they're heavily involved -- but we don't know just who else had a hand or eye in the design.