I can only repeat what I said before: there MAY be users whose name doesn't
match their home directories name, there can be (as in your case) users who
own SEVERAL directories. It is of course possible that the set-up at your
school is totally different, e.g. that by default ALL users homes are owned
by the directory user, and the determining factor is the group-name which
matches a username ... If you could paste a snippet from /etc/passwd and
/etc/group you may get answers that shed a bit more light onto what you're
trying to do there.