0437 GMT November 22, 2019
It is worth mentioning that the Islamic Republic of Iran is the first country which has used the name of Daesh to refer to the terrorist group, IRNA reported.
Backbencher Rehman Chishti asked David Cameron to officially adopt the term, an abbreviation of the group's Arabic name, Al-Dawla Al-Islamyia fil Iraq wa'al Sham.
The name is also sometimes considered to be insulting as it sounds similar to an Arabic expression for 'bigots', The Independent wrote.
'If the Government now officially adopts the term Daesh, we can deprive [the group] of the legitimacy that it seeks,' Christi, the MP for Gillingham and Rainham, wrote in his letter.
Christi has for months been running a campaign to rebrand the terrorist organization, including writing an opinion piece on the subject for The Independent, but the drive has come into renewed focus following the Paris attacks that left 130 people dead.
It has been French government policy since September 2014 to use Daesh to refer to the group.
Rehman's campaign has the backing of some 170 MPs and his website lists a number of diplomats who he says also agree with the idea.
Rehman, a former adviser to the Benazir Bhutto, the assassinated former Pakistani prime minister, argues that using Islamic State, ISIS or ISIL - all names the group has gone under - links the terror organization to Islam and statehood and lends it a degree of legitimacy.
He has also petitioned the BBC on the subject, but the broadcaster declined to alter its policy.