Keep in mind not everyone is American.

I know the WWE, and I have heard of the NHL. But I'm pretty sure if I would and ask people in the streets in my city here in Germany what WWE and NFL are, most people would have no idea. Especially because the NFL is less known than other American sport leagues here. Many people have probably heard of the NBA (to a large extent due to Dirk Nowitzki), and some of the NFL (due to American Football gaining popularity here). Hockey isn't popular here, so the NHL os less known. Also, "hockey" refers to field hockey in Germany. The sport of the NHL is called "ice hockey" here, so people probably wouldn't even make the "H stands for hockey" connection.