PAKISTAN name was not important before establishment of Pakistan as a country. This name only came into limelight in 1946. Note that, the Lahore resolution of 1940 did not mention the name PAKISTAN. Invention of PAKISTAN name did not create Pakistan but the mass support among the Muslims for a separate homeland and the leadership of Jinnah, Suhrawardy, AK Fazlul Haque, Khawja Nazimuddin, Liaqaut Ali Khan etc. The PAKISTAN was a late adoption of the name of the country, It neither hastened or diminished the chance of creating the state. If Muslim League adopted some other name for the proposed state, something like Mughalistan or Muslimstan, still it would have received the same support. If the Muslims particularly Bengali Muslims have not embraced the idea of separate Muslim homeland and made it one of the dominant force within the British India, then Chowdhury Rehmat Ali and his thesis would have remained largely obscured. He only became famous when Muslim League in search for the name of the proposed state, adopted his name. The main reason why this name was adopted because the word 'PAK' , which means 'pure' in Farsi and commonly uses both in Urdu and Bengali and found resonance among the leadership and activists.
The irony was not whether the word 'B' was included in the name of the country but the relative lack of support from the states whose name's first letter found the space in the country's name. Even as late as 1946, when Mr. Jinnah called 'Direct Action day' to achieve Pakistan, only Bengali Muslims responded and sacrificed thousands of life to honor his call.