Why are they called mana?

Excuse me, I have a question that puzzles me. In the context of the topic we're discussing, there's a term mentioned, "mana." Could you kindly elaborate on the origins and reasons behind the name? What exactly does the word "mana" signify, and why has it been chosen to represent this particular concept? I'm quite curious to understand the etymology and significance of this term, and how it fits into the broader context of the topic we're exploring. Thank you for your time and assistance in clarifying this matter.