Currently, we have the tag lego-harry-potter for Lego Harry Potter: Years 1–4 and lego-harry-potter-2 for Lego Harry Potter: Years 5–7. To my knowledge, the two games have never been marketed under those shortened names, and they are a relic of when we had a 25 character limit for tags.
Now that we have a 35 character tag limit, I'd like to recommend the following tag renames:
We can keep the old tags as synonyms if we'd like.