Is most important for organizing customers, right now someone text only first name or only last name, or someone text before last name and then first name or the other way around.

If I understand this request correctly I think it is asking for a separate filed for the customers last name.
If so I 100% agree.
I am getting a lot of bookings with people only putting in the first name.
I need both!
So I then have to waste everyone's time by emailing the customer for their second name.
We need a first and last name fields.

The work around linked above is not sufficient. This needs to be on by default. The last name is needed on the sign up page. aka under the "details" section when viewing Manage > Clients. it would also give us the option to sort by last name on the Manage > Client page.