Robin of the Hood

In the first episodes, or maybe the second, Robin first got the nickname Hood. It started when the two guards were talking about "Robin of the Hood" as they referred to him. Which made sense, the man was about to die (yeah it was the second episode), from the noose. And they a hood on people when they died like this. Somehow, that was made known the everyone, as they began to call him this (which is curious). Gisborne continued to call him Locksleys-which deserves its own post by itself-and so did the Sheriff, sometimes.

HOWEVER, I don't think that the name Hood is something you would go around parading. One could clearly see that the guards were making fun of him. Maybe Robin thought how he easily defined the noose, and the hood, to keep it. Or maybe the name just spread through town to town, and I'm overthinking.