Assuming that these are the results of human dudes mating with girls, it raises a very odd question: why did they overwhelmingly produce clans of giants? The Sethite thesis makes zero sense.
Brian Godawa did a great job putting it together.
Nephilim (Gen. 6:1-4; Num. 13:33)
Anakim (Num. 13:28-33; Deut. 1:28; 2:10-11, 21; 9:2; Josh. 14:12)
Amorites (Amos 2:9-10)
Emim (Deut. 2:10-11)
Rephaim (Deut. 2:10-11, 20; 3:11)
Zamzummin (Deut. 2:20)
Zuzim (Gen. 14:5)
Perizzites (Gen. 15:20; Josh. 17:15)
Philistines (2 Sam. 21:18-22)
Horites/Horim (Deut. 2:21-22)
Avvim (Deut. 2:23)
Caphtorim (Deut. 2:23)
The following are implied as including giants by their connection to the descendants of Anak in Numbers 13:28-29:
Amalekites
Hittites
Jebusites—The word means “Those who trample”
Amorites (Amos 2:9-10)
Hivites
Here were the towns, cities or locations that were said to have had giants in them:
Gob (2 Sam. 21:18)
Hebron/Kiriath-arba (Num. 13:22; Josh. 14:15)
Ar (Deut. 2:9)
Seir (Deut. 2:21-22)
Debir/ Kiriath-sepher (Josh. 11:21-22)
Anab (Josh. 11:21-22)
Gaza (Josh. 11:21-22)
Gath (Josh. 11:21-22)
Ashdod (Josh. 11:21-22)
Bashan (Deut. 3:10-11)
Ashteroth-karnaim (Gen. 14:5)
Ham (Gen. 14:5)
Shaveh-kiriathaim (Gen. 14:5)
Valley of the Rephaim (Josh. 15:8)
Moab (1 Chron. 11:22)
Many significant individuals are described in the Bible implicitly or explicitly as giants being struck down in war against Israel:
Goliath (1 Sam. 17)
Lahmi, Goliath’s brother (1 Chron. 20:5; 2 Sam. 21:19)
Ishbi-benob (2 Sam. 21:16)
Saph/Sippai (2 Sam. 21:17; 1 Chron. 20:4)
Arba (Josh. 14:15)
Sheshai (Josh.15:14, Num. 13:22)
Ahiman (Josh. 15:14, Num. 13:22)
Talmai (Josh. 15:14, Num. 13:22)
An unnamed warrior giant (1 Chron. 20:6)
And unnamed Egyptian giant (1 Chron. 11:23)
Og of Bashan (Deut. 3:10-11)
Har Mo'Ed 
Especially in light of 2TJ texts, yeah, Sethite thesis is completely implausible. What do you make of how the Giants continue to exist after the Flood? A regional and cosmos(world-order) destroying event? Another set of sons of God mingled again with men? Something about Noah’s family line?
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The syntax of Genesis 6 seems to imply that it happened again. I’m not 100% persuaded of that thesis, but it is grammatically plausible. I also lean towards a local, even continental flood.
Theoretically, I think the archons could do something like this again, but I don’t think they will. Short answer why: in the ancient world you needed giants for dominance. Nowadays you don’t. I will post on it later.
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