It's just that there are many people that
think something along the lines of 'OMG, they named my sword from naruto <3' when it really isn't the case. Naruto is about as original as FF is. Nine-tailed beast, ninjitsu, all of those are from old Japanese tales, you can find lots of reference to them that aren't from Naruto.
Now I'm not saying that they wouldn't ever name something from Naruto sometimes, look at the quest names, or FATE names and such. Those are purposely made to be pop culture and puns. But we like to dispel the idea that it's from a certain source when it really isn't. Sasuke's Blade existed in FF well before Naruto ever existed, and probably took the name from the same source. Pretty sure there was a Sasuke weapon in FF4 for Edge in fact, even in the original translation in 1992.
Those that fawn over the fact that the relic weapon and a Naruto character have the same name, and think it's a reference to said character, are stupid or uninformed

Sometimes both, as in the case of die hard fanboys.
EDIT : I just thought of a good way to explain why we keep fixing people when they say things like this.
It's about as smart as saying that because there's Vampires in this game, it's totally referencing Buffy
