Passports and evidence of a name change
The evidence of a name change that is accepted by the Australian Passport Office is listed at https://www.passports.gov.au/getting-passport-how-it-works/documents-you-need/names-and-name-change.
Changing your name is a simple process. A new name is to be recognised simply if it is established by usage. However, many government departments require written evidence of a change of name; this can be obtained through Births, Deaths and Marriages Victoria.
Talya Faigenbaum
Principal Lawyer, Nest Legal
The evidence of a name change that is accepted by the Australian Passport Office is listed at https://www.passports.gov.au/getting-passport-how-it-works/documents-you-need/names-and-name-change.