even though MDMA is the real technical name (and Molly + Ecstasy are nicknames), the name "Ecstasy" is kinda misleading because it's usually MDMA mixed with other stuff, and that's not always good...
the name "Molly" has a pure vibe to it. It's like a warm hug from a friend.
Dr. Andrew Huberman said in his video that MDMA is not actually ecstastic, rather it produce warm feelings and promote inner acceptance and peaceful connections with others.