Name: Xevious
Comments: The Nephilim: These were the Sons of God who in Genesis interbred with humans, creating a race of giants. They were called "The Watchers" in The Book of Enoch.
The Cainites: This was a race of giants descended from Cain who lived in an underworld kingdom called "Arka." Note that the well-known statement in Genesis that "in those days, and after that, there were giants on the earth" is in fact not what the original text stated. What it really said was "giants in the earth."
The Anakim: This was another name for the Watchers. It means 'the descendants of Anak", or Enoch, Cain's son. Though it was said that a flood had been sent to destroy them, there were still entire cities of Anakim in Canaan as late as the time of Moses. And Jewish chronicler Josephus states that even in his own day it was not uncommon for people to dig up gigantic skeletal remains. Spies sent by Moses to scout Anakim strongholds reported back that the Anakim were so large that the Hebrews seemed "like grasshoppers" in comparison.
The Tritons: This was a race of giant gods, spawned by the interbreeding of Poseidon with a mortal woman named Cleito. In some versions of the story they are part-fish. Some are said to have escaped the flood that destroyed Atlantis.
The Titans: These were a Greek race of giants born to Ouranos and Gaia. It is undoubtedly a later retelling of the Triton saga.
Source 1: Source 1