I have asked my friend Professor Boid of Monash University about the etymology of Purim. The suggestion that it comes from a Persian loan word which means 'lots' seems highly suspicious to me.
Just think about it for a moment. Purim is the day that Jews are/were authorized to take vengeance or recompense on those who harm Israel.
Wouldn't it make more sense to connect the word with pry' which can mean 'to pay' or 'to punish' or 'to take retribution' and in the ithpael 'to pay back' and 'to revenge'?
I see moreover the specific forms pwry'n 'payment' and pwryna or 'avenger.' Also pwrynwt and pwrynwta 'repayment, recompense, retribution, reward, punishment, divine visitation' etc.
I am hoping an argument can be made that this is the real root of Purim the logic being that the truth was just covered up owing to the fact that Jews were living under foreign rulers and alongside non-Jews.
Of course the expert always gets the last word.
Stephan Huller has had a life long interest in religion and spirituality 
dating back to conversations with his grandfather, Gaston Frank. "He said we represent one of the last descendants of the Frankist Jewish faith in the world," he muses. "I grew up thinking that our family was something like the Last of the Mohicans."