Everyone names inanimate objects, though typically it's done with dolls or stuffed animals.
Generally speaking I'd be very wary of naming ANYTHING after Guy Fawkes, especially if you learned about him largely from the "V is for Vendetta" movie or afterwards. Let's just say that the movie missed a lot of points entirely, including the Fawkes symbolism. People are looking at him as some kind of hip, anti-establishment revolutionary, when in reality he was more of a Bin Ladin type. It should be noted that the Fawkes symbolism was NOT intended to be a good thing in the graphic novel, "V" was NOT a good guy by any standards, and can very easily be argued to be a lot worse than the people he was fighting against. The graphic novel had none of the off handed referances to American politics and liberal interpetations of what "Bush" might be up to. Nor was the goverment quite as over the top malevolent. Indeed Mr. Susan (the character the movie's Sutter was based on) was very well intentioned, where V had no good intentions at all, he simply wanted revenge and anarchy, there was no higher purpose or desire for human freedom or anything else. The wrong association has rubbed off
on this figure due to the movie, as well as the entire point being implied with that symbolism in the original work... probably having a lot to do with why the creator was so quick to distance himself.
I'd consider another name if you plan to use the bow for anything, and tell people that you named it. Eventually it will probably wind up biting you in the keister. It's almost like someone buying a gun and naming it "Lee Harvey Oswald", or "John Wilkes Booth".