I play a lot with teenagers, and you know what? They don't go to the internet to find names. They use the ones in PHB (the most popular one is the elven name "Faen", which means Satan in norwegian and is a commonly used swear word, naturally). I have no idea why. They're supposed to be "digital natives" and all that, and they spend most of their lives online. Still, that's the way of it. I'm sure they are going to look at the lists of names in XG, and say "Wow, cool! New names to choose from!".
Most of the time, this content isn't going to be useful to me, but I can see its usefulness to others, and especially those kids, and I think it's cool that they get something they like and need. Not everything is about what I need, and anyway - I can also see certain situations when this could indeed be useful to me as well. Sometimes, you're caught without the internet - sometimes, you don't want to put a device on the table just for the sake of googling names. This is perfectly fine to me.