It seems the Unique Name "name" will only prepopulate the "First Name".

It seems the Unique Name "name" will only prepopulate the "First Name". How do I prepopulate "Last Name"?

I am not sure if I have understood your question correctly. Do you mean to say that you are not able to last name of full name field?

Please note that you need to populate first & last name separately. If field name of your name field is "name", here is the URL parameter to populate first & last name:

name[first]=Ashwin&name[last]=D

If you are trying to automatically pass data from one form to another, you need to use following format:

name[first]={name1:first}&name[last]={name1:last}

Where "name" is the field name of form field which you want to populate and "name1" is the field name of full name field which you want to read.

Hope this helps. 

Do get back to us if you have any questions.

You understood correctly. It is [first] and [last] modifiers to name that I was missing. I could not find any documentation for this. Thank you.

You can inspect the field name by pressing CTRL + SHIFT + J and click on the select element icon.

Now, hover your mouse onto the input field and look for the field "name".

Remove the "q5_" and that should your field name which in my sample is "name[last]".

I hope that helps. Let us know if you have any questions or if you need further assistance.