You may be asking yourself why this matters since the individual did not provide contact information. Techies know that deep in the site logs one can find out which domains visitors came from but few in sales and marketing have the know how, time, or interest in digging that deeply for information.
The good news is one of our affiliates has developed an excellent reporting service that provides this information for sales and marketing professionals. After installing their script on your site, each day you receive a report that tells you where your visitors came from, phrases of interest, which pages they visited, how much time they spent on each page, and so on. They also have a handy query into contact databases like Jigsaw to provide sample contact names from the domain / account.