1 Chronicles 20:4
And it came to pass after this, that there arose war at Gezer with the Philistines; at which time Sibbechai the Hushathite slew Sippai, that was of the children of the giant: and they were subdued.
The last 5 giants slain:
1. Sippai [v 4]. Called Saph [2 Sam. 21:18]
2. Lahmi, brother of Goliath [v 5; 2 Sam. 21:19]
3. The Giant with 6 fingers and 6 toes on each hand and foot [v 6-8; 2 Sam. 21:20-22]
4. Ishbi-benob [2 Sam. 21:16-17]
5. Goliath [1 Sam. 21:16-17]
These 5 giants were brothers. In 2 Samuel 21:22 it states that these 4 were brothers; and 2 Samuel 21:19 makes it clear that they were brothers of Goliath, who made up the 5.
From v 5 here we also learn that Lahmi was the brother of Goliath.
These were the last of the mighty races of giants who were the offspring of fallen angels and women in Satan’s efforts to do away with pure Adamite stock so that the Seed of the woman might not come into the world to redeem Adam’s race.
– Dake A.R. Bible: page 441