The name Pakistan was not created after partition. The name Pakistan was created in 1933. It started when Allama Iqbal (who Afghans and Persians call Iqbal-e-Lahori) made a speech on December 29, 1930.
"I would like to see Punjab, North-West Frontier Province, Sindh and Balochistan amalgamated into a single state. Self government within the British Empire or without the British Empire, the formation of a consolidated North-West Indian Muslim state appears to me to be the final destiny of the Muslims, at least of North-West India." Sir Muammad Iqbal
In 1933, Choudhary Rahmat Ali, a Punjabi Gujar Muslim and a political thinker and an idealist who wanted to save every Muslim from Hindu domination wrote his ideas in the famous pamphlet entitled "Now or Never; Are We to Live or Perish Forever", also known as the Pakistan Declaration. The pamphlet started with this famous sentence:
“ At this solemn hour in the history of India, when British and Indian statesmen are laying the foundations of a Federal Constitution for that land, we address this appeal to you, in the name of our common heritage, on behalf of our thirty million Muslim brethren who live in PAKSTAN - by which we mean the five Northern units of India, Viz:
Punjab, North-West Frontier Province (
Afghan Province),
Kashmir,
Sind and Baluchis
TAN." Choudhary Rahmat Ali
By the end of 1933, 'Pakistan' become common vocabulary where an i was added to ease pronunciation.
In a subsequent book Choudhary Rahmat Ali discussed the etymology in further detail.
'Pakistan' is both a Persian and an Urdu word. It is composed of letters taken from the names of all our South Asia homelands; that is, Punjab, Afghania, Kashmir, Sindh and Balochistan. It means the land of the Pure.' Choudhary Rahmat Ali
Choudhary Rahmat Ali - Wikipedia, the free encyclopedia
Muhammad Ali Jinnah later joined the All India Muslim League. As for Urdu speakers they came from Hindu majority areas, which is now part of India, and no one in the Muslim League were interested in those Hindu majority areas. Later close to partition, the Muslim League were to decide how to create Pakistan when Muslims make the majority in both the North-west and in a small eastern part of British India, so they decided on West Pakistan (now Pakistan) and East Pakistan (now Bangladesh) because most Bengali Muslims also wanted to be part of Pakistan in 1947.
Bangladesh is the size of our Sindh Province but it has almost the same population as Pakistan. In 1971, East Pakistan (now Bangladesh) had a larger population than all of West Pakistan (now Pakistan) combined even though Bangladesh is the size of one of our smallest provinces, Sindh.