Put the summary of the bug you're having here
What I expected to happen was...:
Zombie-Villagers to lose name when converted back to Villagers
What actually happened was...:
Villagers retained names when converted.
Steps to Reproduce:
1. name a zombie villager
2. covert zombie villager to villager
This is not a bug - villagers are supposed to keep their name after being zombified. This is the case for every mob that can be converted.