Green’s Dictionary of Slang

(Aus.) an insignificant individual.

1997		Sydney Morning Herald (Sydney) 14 Jan. 34: Footy players may have gone from being Neville Nobodies to multiple home owners thanks to this battle.
2002		Sydney Morning Herald (Sydney) 11 July 40: Who they [i.e UK cricketers] are individually, and what their talents might be collectively, seem to be factors of complete irrelevance to the boofheads and bean counters who run the game. Instead, we mugs are expected to shell out $53 for a decent seat to watch these Neville Nobodys run around. Or should that be aground?