Did the Royal Navy decide never to use the name HMS Hood again after the battlecruiser sank?
Short answerNo; it only rejected a proposal to rename HMS Vanguard as Hood, without permanently retiring the name.
NotesThe loss of Hood did not create a formal rule barring any future ship from carrying the name. A separate suggestion proposed renaming Vanguard in Hood's honour. The Admiralty chose not to make that change. The distinction separates an immediate naming decision from the broader claim that the name itself was permanently forbidden.