hash no good
Hashing achieves nothing much. It would take a computer half an hour to hash every name in Australia. Then having made such an index, you just compare hashes to names, and voila! All your data is suddenly re-identified. It wouldn't even be hard to speculatively hash many names. For example, take the 100 most common first names and surnames, and voila, probably 10% of your leaked data suddenly is re-identified. Expand to the 10,000 most common first names and surnames and you've probably re-acquired 90% of the data. In other words, hash is a fool's paradise.