Well don't leave us hanging, in what language?
It was named after "Mongo, an immensely strong, dim-witted, yet philosophical henchman" in the movie "Blazing Saddles" (which is hilarious but would probably get Mel Brooks burned at the stake if he tried to make it today.)
https://en.wikipedia.org/wiki/Blazing_Saddles
Anyway, "mongo" is short for "mongoloid" which was a derogatory word for folks with what we now call Down Syndrome, and also racist in re: Mongols. So yeah, not a great choice of name.
(That's because "Mongolian idiocy" is the obsolete medical term for DS: https://en.wikipedia.org/wiki/Mongolian_idiocy)