The U.S. has a database of social security numbers of the deceased which is quite interesting for a few reasons. It is closely guarded because social security numbers are assigned sequentially by geographic region so if you know someone’s SSN you can get their date of birth or vice versa.
If you manage to get in that database you are really in trouble because every financial institution has a copy of that list and there is no procedure to get you off. It is quite literally a “financial death sentence.”