Wow, that really is a terrible name -- especially now that "hash array mapped tries" are a popular implementation of persistent hash maps. I wonder if there's any way to justify changing the article name on Wikipedia.
The name HAT was given by its inventor Edward Sitarski in 1996. It looks like few people are implementing it and/or calling it by a different name. Because of this lack of development, it might not be possible to change the name to a more modern, neutral alternative.
