Who was the giant with six fingers and toes?

Answer:

"Yet again there was war at Gath, where there was a man of great stature, who had six fingers on each hand and six toes on each foot, twenty-four in number; and he also was born to the giant. So when he defied Israel, Jonathan the son of Shimea, David's brother, killed him" (II Samuel 21:20-21; see also I Chronicles 20:6-7).

The name of the giant was not given. The context indicates that he was related to Goliath the Gittite, whom David had slain, but it is also possible that this was a different man.