Now generally people say "don't tell the parents you don't like or can see unfortunate associations of a name, it's not your business" but would you in some circumstances?
A friend who has no DCs herself but was very hands on with her two DNs had a colleague expecting BG DTs. They stated their intention of calling them Charlie and Lola. As first time parents they'd never heard of the books. She enlightened them and they said "oops" and rethought the names.