and FOX news refers to him as Usama ?
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The best explanation I have seen (he chose Usama as his Romanized name)
http://www.slate.com/id/2057710/
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Because that's what the FBI calls him. http://www.fbi.gov/wanted/wanted_terrorists/usama-bin-laden
 - I just use "bin Laden." Less chance of embarrassing typos.
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There probably is no "official" spelling of the name in our alphabet.  FWIW, I used to work with a ...