It is time to crack the nut, so to speak.  We begin with a passage in the cepher Chanoch (the Book of Enoch):

Chanoch (Enoch) 8:1-15

It happened after the sons of men had multiplied in those days that daughters were born to them, elegant and beautiful. 2 And when the Watchers, the sons of heaven, beheld them, they became enamored of them, saying to each other, Come, let us select for ourselves women from the progeny of men, and let us beget children.

This verse comports with an initial reference in Bere’shiyth:

Bere’shiyth (Genesis) 6:1-4

AND it came to pass, when men began to multiply on the face of the earth, and daughters were born unto them, 2 That the sons of ELOHIYM saw את eth-the daughters of men that they were fair; and they took them women of all which they chose. 3 And YAHUAH said, My RUACH shall not always strive with man, for that he also is flesh: yet his days shall be a hundred and twenty years. 4 There were Nephiliym in the earth in those days; and also after that, when the sons of ELOHIYM came in unto the daughters of men, and they bore children to them, the same became warriors and tyrants which were of ancient times, men of infamy.

Returning to our reference in Chanoch, we see a roster of those Watchers (whose names will go unmentioned here), and further details about what happens. 

Chanoch (Enoch) 8:10-15

Then they took women, each choosing for himself; whom they began to approach, and with whom they cohabited; teaching them sorcery, incantations, and the dividing of roots and trees. 11 And the women conceiving brought forth giants, and they bore to them three races first, the great giants. The giants brought forth the Nephiliym, and the Nephiliym brought forth the Elioud. And they existed, increasing in power according to their greatness. 12 Whose stature was each three hundred cubits. These devoured all the labour of men; until it became impossible to feed them; 13 When they turned themselves against men, in order to devour them; 14 And began to injure birds, beasts, reptiles, and fishes, to eat one another’s flesh and to drink their blood. 15 Then the earth reproved the unrighteous.

Here, we see that the first generation of offspring from the cohabitation of the Watchers and women on earth, were the great giants.  These were the progenitors of the Nephiliym, who in turn were the progenitors of the Elioud.  Is there another reference within scripture as to the name of the great giants?  Actually, there are many.

Here are a few verses (although this first verse is going to be a challenge) to consider:

Bere’shiyth (Genesis) 14:1-7

AND it came to pass in the days of Amraphel king of Shin`ar, Aryok king of Ellacar, Kedor-la`omer king of Eylam, and Tid`al king of Nations; 2 That these made war with את eth-Bera king of Cedom, and with את  eth-Birsha king of Amorah, Shin’av king of Admah, and Shem’eber king of Tsevo’iym, and the king of Bela, which is Tso`ar. 3 All these were joined together in the valley of Siddiym, which is the Salt Sea. 4 Twelve years they served את eth-Kedorla`omer, and in the thirteenth year they rebelled. 5 And in the fourteenth year came Kedorla`omer, and the kings that were with him, and smote את eth-the Repha’iym in Ashteroth Qarnayim, and את eth-the Zuziym in Cham, and את eth-the Eymiym in Shaveh Qiryathayim, 6 And את eth-the Choriym in their Mount Se`iyr, unto Eyl Pa’ran,  which is by the wilderness. 7 And they returned, and came to Eyn Mishpat, which is Qadesh, and smote את eth-all the country of the Amaleqiym, and also את eth-the Emoriym, that dwelt in Chatstson Tamar. 

We have three groups to consider in this passage, which shall return again in later witness, and these are: the Repha’iym (Anaqiym), the Zuziym (Zamzummiym), and the Eymiym.  All of these were accounted as giants.

Devariym (Deuteronomy) 2:10-11

The Eymiym dwelt therein in times past, a people great, and many, and tall, as the Anaqiym; 11 Which also were accounted Repha’iym, as the Anaqiym; but the Mo’aviym call them Eymiym.

Devariym (Deuteronomy) 2:19-21

And when you come nigh over against the children of Ammon, distress them not, nor meddle with them: for I will not give you of the land of the children of Ammon any possession; because I have given it unto the children of Lot for a possession. 20 (That also was accounted a land of Repha’iym: Repha’iym dwelt therein in old time; and the Ammoniym call them Zam-zummiym; 21 A people great, and many, and tall, as the Anaqiym; but YAHUAH destroyed them before them; and they succeeded them, and dwelt in their stead:

Devariym (Deuteronomy) 3:11-13

For only Og king of Bashan remained of the remnant of Repha’iym; behold, his bedstead was a bedstead of iron; is it not in Rabbath of the children of Ammon? nine cubits was the length thereof, and four cubits the breadth of it, after the cubit of a man. 12 And את eth-this land, which we possessed at that time, from Aro`er, which is by the river Arnon, and half Mount Gil`ad, and the cities thereof, gave I unto the Re’uveniym and to the Gadiym. 13 And the rest of Gil`ad, and all Bashan, being the kingdom of Og, gave I unto the half tribe of Menashsheh; all the region of Argov, with all Bashan, which was called the land of Repha’iym.

At this point, we should be able to determine that in the first instance, the children of the Watchers were called Repha’iym, and in their tribal regions, they were known as Anaqiym, Zamzummiym (Zuziym), and Eymiym.

For further reading...

The Giants - Part 2

The Giants - Part 3

The Giants - Part 4