What were the Nephilim? The Nephilim, a word meaning Giants, were the progeny of the Watchers and human women. Greek mythology also speaks of Giants. The Nephilim were also connected with the Anakin and Rephaim. The latter were a mysterious group also known as Underworld dwellers. Most people do not know this, as the word Rephaim is translated in many English Bible versions as "the dead." Zecharia Sitchin, in a confusion of Hebrew and Aramaic, alleged that the Nephilim were "fallen ones" and confused them with their fathers, the Watchers. Ancient languages scholar Dr. A. Nyland sifts through the evidence to tell us what we do and don't know about these mysterious ancient beings.