Whence "Purim"?

M'gilas Ester is very clear about the name of the holiday (9:26):

עַל כֵּן קָרְאוּ לַיָּמִים הָאֵלֶּה פוּרִים
So they called these days F urim

Where does the current name of Purim come from?

• Is it, perhaps, simply a common mispronunciation? If so, is there any record of protests from great rabbis, encouraging people to call the holiday Furim?



• Or was the name officially changed at some point? When? By whom? Why?


• Or what?

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