No it is real, however there is another rule called trademark dilution. You can't use someone else's ubiquitous trademark, even if it is totally unrelated. You

No it is real, however there is another rule called trademark dilution. You can't use someone else's ubiquitous trademark, even if it is totally unrelated. You could call your store Gnome Bikes, but you can't call it Google Bikes. Google is too famous and too unique.