I would suggest storing the name in the hash you are using as the object - like with a key such as '_name'. You can then change your methods like:

  sub myNameIs{
    my ($this,$name) = @_;
    die("Don't tell me that I don't have a name.") unless(defined($nam
+e));
    
    $this->{_name} = $name;
  }
  
  sub whoAmI{
    my ($this ) = @_;
    return($this->{_name});
  }
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/J\