🔼The name Sippai in the Bible
There is only one Sippai in the Bible and he was one of four sons of "the giant" (or Raphah in Hebrew) who was most likely Goliath of Gath, who was famously slain by young David in the valley of Elah (1 Samuel 17:2).
Sippai and his brothers couldn't get enough of fighting Israel, but they were done in during several battles near Gob and Gezer. According to the Chronicler, Sippai was slain by Sibbecai the Hushathite at Gezer (1 Chronicles 20:4). The book of Samuel tells the same story, but calls this giant Saph and places his demise at the battle of Gob (2 Samuel 21:18).
🔼Etymology of the name Sippai
The name Sippai, is the name Saph with a final י (yod), and the name Saph is identical to the noun סף (sap), which denotes the outer extreme of a house, or its door's threshold:
The letter י (yod) at the end of our name turns the noun סף (sap) into an adjective or possessive form: my saph, saph of, or pertaining to saph.
The name Sippai most probably expresses an affinity with the outer rim of a protected area, and probably is akin the phrase שמר הסף, or Gatekeeper.