The word is only found in two places. One refers to before the Flood, the other to the time of Joshua. The Bible does not say Goliath was Nephilim.
The pre-Flood Nephilim are referred to as the “sons of God,” those of Joshua’s day as the “sons of Anak.”
It seems entirely reasonable to me that the writer of Numbers was referring to the size and ferocity of the men they saw while spying, not to their ancestry.
More critically, God very clearly says in Genesis that he is destroying all life on the earth due to the wickedness of men, specifically the Nephilim their leaders.
To believe that some survived the Flood would mean that God was incapable of making that happen. It would also mean many of the people around in the time of Joshua and possibly today are not descended only from Noah, which the Bible says.
Personally I don’t care to go there.
The American Indians encountered strange giants who were called the red haired giants.
There is physical proof that they existed here in the Americas and all around the world, many remains of giant bines, skeletons have been discovered and still is being discovered around the world.
Some suspect that the American Indian practice of lifting a hand and say “ How “ was to make sure that the stranger was not a 6 fingered Nephellium.
Not all Nephellium were giants, but all giants of old were Nephellium.
Those Nephellium before the flood did not survive.
The bible tells us that there was Nephellium in those days, before the flood, and after, after the flood.
The fallen ones , the fallen angels, re-entered the earth after the flood.
Watch Trey Smith’s video of the Nephellium on you tube, and LA Marzilli’s material, also Chuck Missler.
God wipped out the world with a flood because all, or most flesh became corrupt, why then ? There are no more dinosours ? Certain species before the flood do not exsist after the flood ?
All flesh became corrupted by the DNA of the Nephellium except 8 pure humans, Noah and his family, and the animals that God commanded to put in the Ark.
Jesus Christ said “ As so was the days of Noah, so shall the day or days of the son of man be “ the 2nd return of Jesus Christ.