PostgreSQL trigger functions. How to make a function that creates a table whose name is equal to the value of the cell in the table to which the trigger is attached?

Question

PostgreSQL

It is necessary to make base in which at creation of the user the table is created to it. The table needs to be identified somehow, so I decided to name the tables the same as the user's key. There are no questions about creating a trigger, but there are questions about the function. I'm not even close to how to do it. I'm already thinking about just adding records like "USER KEY - VALUE" in one additional table, but I'm not sure that this way the search will work faster.