UK missiles are not assigned codes as in other countries; for example, the United States of America (USA).
Rather, they are just given names which are found to be more meaningful and easier to remember and intended to invoke a sense of the missile and its capability.
As new UK missiles are not introduced into service very often there is no set naming process.
Typically, once the development of a new missile system reaches a point of maturity a product name is decided by the Ministry of Defence (MOD) and the manufacturer.
The name will be subject to copyright checks by the manufacturer but there is no cost to the taxpayer.
FOI 2018/05824 dated 21 May 2018.