Strong's #6825: Tsphow (pronounced tsef-o')
 or Tsphiy {tsef-ee'}; from 6822; observant; Tsepho or Tsephi, an Idumaean:--Zephi, Zepho.
Brown-Driver-Briggs Hebrew Lexicon:
 / 
  tsephô / tsephı̂y 
 
 Zepho or Zephi = "watch-tower" 
 1) son of Eliphaz and grandson of Esau and one of the chiefs of the Edomites
 
  Part of Speech: noun proper masculine
Relation: from H6822
 
 
Usage:
This word is used 3 times:
Genesis 36:11: "were Teman, Omar,  Zepho, and Gatam, and Kenaz."
Genesis 36:15: "duke Omar, duke  Zepho, duke Kenaz,"
1 Chronicles 1:36: "of Eliphaz; Teman, and Omar,  Zephi, and Gatam, Kenaz, and Timna, and Amalek."