An interesting Lastname, Firstname, Middlename challenge

SQL Apprentice Question
I'm sure you all have seen situations where a field has a combined name
in the format of "Lastname, Firstname Middlename" and I've seen
examples of parsing that type of field. But what happens when the data
within this type of field is inconsistent? Here are some examples

Apple, John A.
Berry John B.
CherryJohn C
Donald John D


How does one parse the data when the data isn't consistent?


Celko Answers
>> How does one parse the data when the data isn't consistent? <<


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unless you want to make a major project of it for a few years.