What is JotForm?
JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
Have you tested just using the full name field under quick tools? I think it would come on Salesforce just one field once you map it on the integration wizard.
By the way, Salesforce allows custom field too. You can create a single full name field on Salesforce and use it on the integration.
Let us know if we can be of further assistance.