Вот такая теория на сайте http://www.mugglenet.com/...ryffindortower/gt10.shtml.
ну короче там разные теории про 6-ую книгу.Одна из них про Снейпа
As I reread the chapter of OotP when Harry enters Snape's pensieve, I noticed that while he was inside Snape's memory at Hogwarts, no one addressed Snape as either "Severus" or "Snape." Members of James's gang called him "Snivellus" or "Snivelly" every time. We didn't even see Snape's name on the top of his O.W.L. test. I also noticed that James called Lily "Evans," and did so many times. I began to wonder whether or not Snape was called Snape back when he was at Hogwarts. I remembered how Tom Marvolo Riddle used an anagram for his name when he sold out to the Dark Side, and I thought Snape, the former Death Eater, might have done the same. Imagine my shock and horror when I realized that the same letters used to spell "Severus Snape" can be used to spell "Perseus Evans." Now, Snape did call Lily a Mudblood, so they are probably not siblings...but perhaps half siblings, or cousins? I did some further research into the name Perseus and f!ound that there is a constellation named Perseus, and also that Perseus was a figure in Greek mythology most famous for the slaughter of Medusa (Bellatrix Lestrange??). I believe that this is much too coincidental not to have some merit, and we could possibly find out a whole lot more about Snape and his background in subsequent volumes of this series.
ну короче смысл в том что Снейп может быть двоюродным братом или кузеном Лили Эванс.И сюда по этой догадке Гарри должен называть Снейп примерно "дядушка Северус" или "дядя Сев" .Интересно после этой фразе кто раньше умрёт ,Гарри от рук СНейпа ,или Снейп повесится
ну и мысли у людей