Because core names rarely or never appear when marketting!
Do you see what kind of Pentium 4 core is used when you read or check out system adds?
AMD rarely also advertises what core they use, but I saw once a page for their new AthlonXP when it came out, saying it uses the Palomino core.
Marketting department majorly applies for the name which will appear everywhere. Intel's department must be filled with drool jumping up and down like dogs awaiting the next chance they have to label PENTIUM V on their CPUs, I am sure of that!
BTW what does PR stand for in marketting terms?
As for why they chose such themes, I don't know really, some people like to name things like they want, and often because they like that theme. I saw Jerry Sanders' face, he looks like he's a farm-type guy, who had a horse, or maybe was a cowboy!
As for Intel's naming, like I said, it depends on taste. FatBurger had Tualatin river near him, I think.
The sound of determination is the echo of will...