In Genesis, the fallen angles described by Moses when he speaks about the earth being cleansed by flood, are called Nephilim (hebrew). Nephilim is plural for the singular Nephi.
It may interest you to know that the name Nephi is NOT a Hebrew name -- it is Egyptian, as is the name of Nephi's younger brother, Sam. I always thought it was odd that a name like Sam would appear in the Book of Mormon until I learned that Sam is the Egyptian form of Shem. Also of note is the fact that Laman and Lemuel, Nephi's older brothers, have Arabic names, and the two younger brothers who were conceived during the days of their wandering in the wilderness, were named Jacob and Joseph, which ARE Hebrew names.
It is a well known fact that in Old Testament times names given were very significant and had a meaning associated with the circumstances of their birth or family circumstances -- read the OT account of the births of the 12 sons of Jacob, and you'll see that very clearly. Also note that when Jacob wrestled with God until he had received a blessing, he called the name of the place Peniel, which means "The Face of God."
Now, isn't it interesting that we find three different origins for the names of Lehi's children. The naming of the youngest two, Jacob and Joseph, clearly indicates a connection with the 400 years the Israelites spent wandering in the wilderness. The family of Lehi only spent 8 years, but it must have been equally challenging for them, nonetheless, during that time. Is it possible that the names of Lehi's other children similarly reflect the circumstances in which Lehi found himself at the time of their birth?
And how likely do you think it is that a young man such as Joseph Smith, with very little education, could have hit that nail right on the head if he was just making it up?
It is also the name given by God to fallen angels in Genesis.....maybe this is why ....Joseph Smith, with very little education, could have hit that nail right on the head if he was just making it up? He was given the information by a fallen angel and a minion of Satan. Does that answer you question in a way you might not have wished?