From BiblePortal Wikipedia

Smith's Bible Dictionary [1]

Sib'becha-i. (a weaver). One of David's guard, and eighth captain, for the eighth month, of 24,000 men of the king's 1043. He belonged to one of the principal families of Judah, the Zarhites , or the descendants of Zarah or Zerah , and is called "the Hushathite ," probably from the place of his birth.

Sibbechai's great exploit, which gave him a place among the mighty men of David's army, was his single combat with Saph or Sippai , the Philistine giant, in the battle at, Gezer or Gob.  2 Samuel 21:18;  1 Chronicles 20:4.