So this is a bug relatively new to me.  So getting straight to the point...

I bought nametags from a villager and I tried naming these directly after. But the game refused me to name them when I obviously did this "asdfghjk" as to try to give said item a name. the Nametag didnt work so I tried naming my shovel and same result...

These are the examples of naming items for you. The shovel I used as example and the nametags.