Saph

SAPH (Heb. saph, a basin, threshold). A Philistine giant, one of the four champions of the race of Rapha who was killed by one of David’s heroes (2Sam.21.18; “Sippai” in 1Chr.20.4).

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SAPH săf (סַ֕ף). A descendant of the Philistine giants, and one of four champions who were slain by a member of the “Thirty,” Sibbecai the Hushathite, in a fight with the Philistines at Gob (2 Sam 21:18); called Sippai in 1 Chronicles 20:4. Some scholars have thought that he was a son of the giant Goliath, but this is uncertain.

International Standard Bible Encyclopedia (1915)

A Philistine, one of the four champions of the race of Rapha ("giant") who was slain by Sibbecai, one of David’s heroes (2Sa 21:18; 1Ch 20:4). It is supposed by some that he was the son of the giant Goliath, but this is not proved. In 1Ch 20:4, the same person is called "Sippai."