It is highly unlikely that
Gwyneth Paltrow's daughter will get as much teasing as the average girl would get for being named Apple. She is highly unlikely to go to a regular school, for instance, but will probably end up in an expensive private school where a lot of the other kids are children of celebrities. She will be raised in an environment of wealth and security (both financial and anti-crime types of security) and just won't run across as many people who will be willing to insult her or her parents as the average child would.
The celebrities who give their children unusual names are those in fields where having a self-concept of "creativity" is important. It is primarily actors, singers, and other people who see themselves as "artists" who do this. Giving their child an uncommon names fits in with their self-concept as being creative and unusual people.
And in
Gwyneth Paltrow's case -- her mother is the actress
Blythe Danner, she was named
Gwyneth -- she certainly has a lot of role models in her family as to giving daughters uncommon names! :)