Hi Windy,
I've attached a couple of spots it lives, and just in case you haven't removed "unwanted" from both, give it a shot.
On the left where your folder/labels are, click on the 3 dots next to it, and click remove (I assume you got rid of it this way, and it still comes back)
Before the next step, can you make sure no emails are under that label.
Click on the gear box in the top right, then settings, then labels. Scroll down, and delete it from the list.
See if it will not stay deleted.
Let me know!
- C