This list of mythical creatures that begin with this letter and I am constantly gathering information from each continent, and is continually being updated.
Nephilim (Abrahamic mythology)
The Nephilim are mysterious beings or people in the Hebrew Bible who are described as being large and strong. The Hebrew word Nephilim is sometimes translated as "giants", and sometimes taken to mean "the fallen ones". Their origins are disputed. Some view them as offspring of fallen angels and humans. Others view them as offspring of the descendants of Seth and Cain.
The Hebrew of “nephilim”, which may mean “those causing others to fall.” Abraham Ibn Ezra says they were called this because men's hearts would fail at the sight of them. With the Nephilim as mere humans, their “great size” is variously taken literally or metaphorically, though they were undoubtedly considered great warriors.