Which School?

[uscsmarine4]

No: HPFGUIDX 131181

  I'm sorry if this has been addresed before, but I've been away for 
some time and haven't had a chacne to catch up. 
  I was re-reading Goblet of Fire and noted that the goblet has to have 
the name and school of everyone who wishes to participate. This is 
mentioned several times through the book, but the school is never 
given. JKR never says what school Harry was entered under. He must have 
been entered under a fourth as the goblet chooses only one champion from 
each school. What, if any, significance is this obvious failure to say 
what school he was entered under.