In the early days a mistake was easily made by the civil official.
He could easily mishear a name and wrote the wrong name on the document.
In the family archive are several documents who have such little mistakes.
In that time civilians where not quick-witted and signed the documents with all the mistakes.
A few examples are:

                    
                  Huning before 1811                       Huning Veringa after 1811

                   
                  Veeringa before 1830                            Veringa after 1830