Firstly ..
ChiRho is a biblical term .. used very often to refer to christ
ChiRho
The ChiRho Controversy
Now, back to winxp
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Actually XP stands for eXPerience.
Or more truly to the real world, eXPerimental. (SCNR)
I've heard that it stands for Cross Point, as in the OperatingSystem with which the majority of the userbase crosses over to the NT platform. Is this totally unfounded?
Also said to be from the Greek letters Chi and Rho, which when said together sound like "Cairo", which at one time was the code name for a proposed future version of NT. Cairo never materialized, but parts have found their way into Windows 95, Windows XP, and the upcoming "Longhorn" release.
The code name for Windows XP (and for Windows Server 2003, which shares the code base) was "Whistler".
In the Macintosh community, it is commonly believed that Windows XP was named in imitation of Macintosh OSX as a marketing ploy to promote that Windows is "just like" Macintosh in terms of an attractive and easy-to-use GUI. Mac OSX was released March 24, 2001, and Windows XP was released October 25, 2001, although names for both of these products were no doubt assigned many months before the releases.
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source :: *c2.com/cgi/wiki?WindowsXpNameDiscussion