Andy is correct. "Octopi" is applying a latin plural form to a greek word. I first learnt this from an expert in the field: http://www.psych.uleth.ca/Links/Evol...evolution.html.
I've wondered in the past if the plural of "Jesus" is "Jesi". Probably not. 
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-Quinn
Man, n. ...His chief occupation is extermination of other animals and his own species, which, however, multiplies with such insistent rapidity as to infest the whole habitable earth, and Canada. - A. Bierce, Devil's Dictionary, 1906
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