I haven't met a Chloe, Phoebe, or Xanthe. I think I've run across a Zoe while working before. I think Zoe will last longer all around. I really like both. I prefer Zoe over Chloe because I love the meaning. I like Zoe spelled that way and Zoi (an alternate Greek transliteration) and Chloe spelled that way and Khloe (also works as an alternate transliteration from Greek). Khloe probably got popular because of the whole K trend that seems to be happening with the Y trend. The parents probably just thought they were being creative. I like Zoe, Chloe, Phoebe, and Xanthe, but the only one I would consider using is Zoe.