In the top right corner of a search page you should see a small drop down menu called 'View" (it's to the right of the "Sort" drop down menu). Click on that, then click on the option that says "Customize".
There are a bunch of options that you can adjust to customize what you see when you search, including one called "Seller information". That's the one you want to check off to see the seller's names for each item when you search.
