I think it is a real bogan name - ie: that child would be branded as a bogan and treated as one before people had the chance to find out otherwise (or alternatively, whether they were correct in boganifying him ).

Incidentally, Harley is actually an old English name meaning "meadow" or "from the Hare's Wood" (how surpirsed was I to find the well spoken retired-barrister father of the bride at a wedding I went to once was a Harely!)

As for Holden, it too is an old english name meaning "deep valley".

"Calais" Greek, meaning "chaging colour" (or something similar).