The movie is somewhat different from the series, remember. The other thing is that Ra was (as far as I know) the only Supreme System Lord, and therefore could name his First Prime/Jaffa anything. For a list of the changes between the series and the movie, go here:
http://en.wikipedia.org/wiki/Differe..._Stargate_SG-1
http://en.wikipedia.org/wiki/Differe..._Stargate_SG-1
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