WASHINGTON—The U.S. government plans to give up control over the body that manages Internet names and addresses, a move that could bring more international cooperation over management of the Web, but will make some U.S. businesses nervous. The Commerce Department said Friday it plans to relinquish its oversight of the Internet Corporation for Assigned Names and Numbers, or Icann, which manages a number of technical functions that serve as signposts to help computers locate the correct servers and websites. The action is viewed as a response to increasing international concern about U.S. control over the Internet's structure, particularly in light...