Email recipient's pre-completed details on landing page?

I’m using email marketing to generate interest in some free eBooks. I am using Mailchimp, but want a landing page on my WordPress site that already has their details already filled out in the form that precedes a short survey before they download the assets.

What I need to know is what plugin/integrator do I need to pass the recipient’s name info into the form on the landing page?

What you would do is save the information in a cookie and read the cookie on the following page. I don’t know if there is a plugin that will do this. It sounds like a custom project. Though not necessarily a big one.