Noting that the original question was asking “...where the strata management gets the owners’ names...” here’s something people may not be aware of.
I am the Secretary of a small OC in Victoria and when a unit was sold recently I received a document from Pexa which contained the following details:
Name of seller, their new address, their phone number and email address, and the name and details of their lawyer
Name of buyer(s) their previous address, their phone number(s) and email address(es), date(s) of birth, and the name and details of their lawyer.
And being a document received as part of the Owner’s Corporation normal business it is discoverable by anybody who has legal access to our files.