Why '1984'?
Orwell's title remains a mystery. Some say he was alluding to the centenary of the Fabian Society, founded in 1884. Others suggest a nod to Jack London's novel The Iron Heel (in which a political movement comes to power in 1984), or perhaps to one of his favourite writer GK Chesterton's story, "The Napoleon of Notting Hill", which is set in 1984.
In his edition of the Collected Works (20 volumes), Peter Davison notes that Orwell's American publisher claimed that the title derived from reversing the date, 1948, though there's no documentary evidence for this. Davison also argues that the date 1984 is linked to the year of Richard Blair's birth, 1944, and notes that in the manuscript of the novel, the narrative occurs, successively, in 1980, 1982 and finally, 1984. There's no mystery about the decision to abandon "The Last Man in Europe". Orwell himself was always unsure of it. It was his publisher, Fred Warburg who suggested that Nineteen Eighty-Four was a more commercial title.