The name of "Satan"
It's a Hebrew word that means resistor because he intensely antagonises God and all his followers on earth he is the incarnation of stubborn opposition.
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1After this judgment they shall be astonished and irritated; for it shall be exhibited to the inhabitants of the earth.
2Behold the names of those angels. These are their names. The first of them is Samyaza; the second, Arstikapha; the third, Armen; the fourth, Kakabael; the fifth, Turel; the sixth, Rumyel; the seventh, Danyal; the eighth, Kael; the ninth, Barakel; the tenth, Azazel; the eleventh, Armers; the twelfth, Bataryal; the thirteenth, Basasael; the fourteenth, Ananel; the fifteenth, Turyal; the sixteenth, Simapiseel; the seventeenth, Yetarel; the eighteenth, Tumael; the nineteenth, Tarel; the twentieth, Rumel; the twenty-first, Azazyel.
3These are the chiefs of their angels, and the names of the leaders of their hundreds, and the leaders of their fifties, and the leaders of their tens.
4The name of the first is Yekun: (68) he it was who seduced all the sons of the holy angels; and causing them to descend on earth, led astray the offspring of men.
(68) Yekun may simply mean "the rebel" (Knibb, p. 160).
5The name of the second is Kesabel, who pointed out evil counsel to the sons of the holy angels, and induced them to corrupt their bodies by generating mankind.
6The name of the third is Gadrel: he discovered every stroke of death to the children of men.
7He seduced Eve; and discovered to the children of men the instruments of death, the coat of mail, the shield, and the sword for slaughter; every instrument of death to the children of men.
8From his hand were these things derived to them who dwell upon earth, from that period for ever.
9The name of the fourth is Penemue: he discovered to the children of men bitterness and sweetness;
10And pointed out to them every secret of their wisdom.
11He taught men to understand writing, and the use of ink and paper.
12Therefore numerous have been those who have gone astray from every period of the world, even to this day.
13For men were not born for this, thus with pen and with ink to confirm their faith;
14Since they were not created, except that, like the angels, they might remain righteous and pure.
15Nor would death, which destroys everything, have effected them;
16But by this their knowledge they perish, and by this also its power consumes them.
17The name of the fifth is Kasyade: he discovered to the children of men every wicked stroke of spirits and of demons:
18The stroke of the embryo in the womb, to diminish it; (69) the stroke of the spirit by the bite of the serpent, and the stroke which is given in the mid-day by the offspring of the serpent, the name of which is Tabaet. (70)
Also, why according to Enoch is Azazeel (one of the Watchers) punished for the crime of the fallen angels? Was it because he showed man warfare? And from above it looks like Gadrel is not Azazeel, right? Azazeel is a Watcher and Gadrel is a Chief - are they the same?
1Moreover Azazyel taught men to make swords, knives, shields, breastplates, the fabrication of mirrors, and the workmanship of bracelets and ornaments, the use of paint, the beautifying of the eyebrows, the use of stones of every valuable and select kind, and all sorts of dyes, so that the world became altered.
Enoch3 Saying, Say to him in my name, Conceal yourself. 4 Then explain to him the consummation which is about to take place; for all the earth shall perish; the waters of a deluge shall come over the whole earth, and all things which are in it shall be destroyed. 5 And now teach him how he may escape, and how his seed may remain in all the earth. 6 Again the Lord said to Raphael, Bind Azazyel hand and foot; cast him into darkness; and opening the desert which is in Dudael, cast him in there. 7 Throw upon him hurled and pointed stones, covering him with darkness; 8 There shall he remain for ever; cover his face, that he may not see the light. 9 And in the great day of judgment let him be cast into the fire. 10 Restore the earth, which the angels have corrupted; and announce life to it, that I may revive it. 11 All the sons of men shall not perish in consequence of every secret, by which the Watchers have destroyed, and which they have taught, their offspring. 12 All the earth has been corrupted by the effects of the teaching of Azazyel. To him therefore ascribe the whole crime.
1Then the Most High, the Great and Holy One spoke,
2And sent Arsayalalyur (12) to the son of Lamech,
(12) Arsayalalyur. Here one Greek text reads "Uriel."
Chapter 13 1 Then Enoch, passing on, said to Azazyel: You shalt not obtain peace. A great sentence is gone forth against you. He shall bind you; 2 Neither shall relief, mercy, and supplication be yours, on account of the oppression which you have taught; 3 And on account of every act of blasphemy, tyranny, and sin, which you have discovered to the children of men.
The book of Henoch is a collection of originally distinct texts written over about 2 centuries (2nd BC to early 1st AD), whence the discrepancies. Gadreel in chapter 69 (Book of Parables) plays the role ascribed to Azaz'el in chapter 8 (Book of the Watchers). In other apocalyptic traditions Eve's seducer is called Samael (Targum Pseudo-Jonathan, 3 Baruch 4:8; 9:7).