the ship no4 got name korolov (actually korolev) cuz of it bad grammars second version of answer, SG-1 related : Ship had name Korolev, and was given this name due to agreement between US Government and Russia. It was payment for Stargate Pernament ownership change [before it was only leased from Russians for some time] and Russia choosed to name it Korolev, after Sergey Korolyov [or Sergey Korolev if you prefer] who was Head Rocket Engeener during space race in 1950s and 1960s of Soviet Union.