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.
At JotForm, we want to make sure that you’re getting the online form builder help that you need. Our friendly customer support team is available 24/7.
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.
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If someone forgot to enter his name there's no way to know name of that person, however, you can still know the email address if you have an email field in your form. You can also know the IP address of the person who submitted the form, it appears in the submmissions in the submission page:
However to avoid this inconvenient you should setup the name field as required, to do it please follow these steps:
1. While editing your form Click ove the Name field.
2. Click on Required option. Then save your form.
In that way If someone forgets to enter the his name won't be able to submit the form until he enters the name.
I hope this helps. Let us know if you need further assistance.