Meaning of name "Mongolia"

There are many speculation about origin of name "Mongol" or "Mongolia".
One possible explanation of "Mongol" is "Munkh-Gal" or "Eternal Fire". Here Munkh in Mongolian means "Eternal" and "Gal" mean " Fire".
In old Mongolian script, Mongol is spelled "Monggol". Last part of the word or "Gol" means "River" in Mongolian. Therefore, Mongol may mean " Mon River".
There are many other explanations for beautiful name of "Mongolia".


Wikipedia guesses "Mongol" means "Brave" or "Fearless". In English and Russian, "Mongol" changed into Mongolia or Монголия.