of uncertain etymology; much disputed.
But, the Yahwist describes the nephilim as “heroes that were of old, warriors of renown,” not as gods or even demi-gods.
There are those who dispute the meaning of the noun nephilim and derive it from Naphal, which signifies "to fall."
Their name as given in the old Testament, 'nephilim' means 'fallen ones.'
Let the rabbis vouch for the correctness of this; it is ridiculous to call them "nephilim" because others fell.