Hello,
This Client Naming format is part of the design of ServiceM8 which adheres to Accounting Standards (Last Name, First Name).
This naming automatically kicks in if the Client Name and the Contact Name on the Job are the same (ie… "John Smith" & "John Smith" becomes "Smith, John" & "John Smith").
First let me say YOU WANT THIS TO BE THE CASE AND YOU WANT TO MAINTAIN THESE STANDARDS, but if you REALLY want to deviate from this, the ONLY way to do so is to make the content entered into these fields different (ie… "John Smith" & "J Smith" or "Mr John Smith"). Just having these fields slightly different will stop ServiceM8 from changing the type of client from a business to an individual (which is what is also happening).