de Havilland DH 125
Hawker Siddeley HS125,
British Aerospace BAe 125,
Hawker 125,
or Hawker 800/850?
In April 1961 de Havilland, by then a part of Hawker Siddeley Aviation, announced that it had started work on a jet replacement for the popular Dove. Initially it was going to be called the DH125 Jet Dragon, as a recognition to the highly respected Dragon Rapide. Though the name, Jet Dragon, didn't last into the prototype stage.
Hawker Siddeley HS125
In 1963 decision was made by Hawker Siddeley to rebrand all products of its subsidiary companies as Hawker Siddeley. de Havilland became a division of the Hawker Siddeley group back in 1960 but its products were still branded de Havilland until 1963. Thus the aircraft became the H.S. 125.
British Aerospace BAe125
In 1977 the British Aircraft Corporation merged with Hawker Siddeley to form British Aerospace. The 125 then became the BAe 125, with the 125 being part of BAe's Business Jets Division.
Raytheon / Hawker
This division was sold to US company Raytheon in 1993. Another name change occurred with the aircraft becoming the Raytheon Hawker 125. Later to become Hawker, with the latest company to build the 125. Hawker Beechcraft.
C-29, U-125 and the Dominie
Of course, Military operators of the 125, of which there are many. never seem to call any aircraft by its proper name. The Royal Air Force called their original Series 2 H.S.125s the Dominie T Mk1. Their series 400 aircraft became the H.S. 125 CC Mk 1. The series 600 aircraft became the H.S. 125 CC Mk 2 and finally the series 700 aircraft are H.S. 125 CC Mk 3s.
The United States Air Force (USAF) designated their 125s as C-29 and use them for calibration work. Where as the Japanese Defence Force names their flight inspection 125s as U-125 and their search and rescue aircraft U-125As