From the Summary: "Names for Navy ships traditionally have been chosen and announced by the Secretary of the Navy, under the direction of the President and in accordance with rules prescribed by Congress. Rules for giving certain types of names to certain types of Navy ships have evolved over time. There have been exceptions to the Navy's ship-naming rules, particularly for the purpose of naming a ship for a person when the rule for that type of ship would have called for it to be named for something else. Some observers have perceived a breakdown in, or corruption of, the rules for naming Navy ships. On July 13, 2012, the Navy submitted to Congress a 73-page report on the Navy's policies and practices for naming ships."
CRS Report for Congress, RS22478
Congressional Research Service: https://crsreports.congress.gov/