Joe Bloggs was the name of a clothing brand which became popular during the Madchester baggy era of the late 1980's.
Even though no-one has actually worn Joe Bloggs clothes since about 1993, teachers in Britain (due to a lack of imagination) continually refer to this as an example name.
Teacher: "If I have nine apples and Joe Bloggs takes away three apples, how many do I have left?"
Pupil: "Who the fuck is this Joe Bloggs? Sounds like a pikey bastard if he has to steal apples."