Strong's #634: 'ecar (pronounced es-sawr')
 of foreign derivation; Esar- chaddon, an Assyrian king:--Esar-haddon.
Brown-Driver-Briggs Hebrew Lexicon:
 ־ּ 
  'êsaṙchaddôn 
 
 Esarhaddon = "Ashur has given a brother" 
 1) king of Assyria in the seventh-century BC
 
  Part of Speech: noun proper masculine
Relation: of foreign derivation
Usage:
This word is used 3 times:
2 Kings 19:37: "escaped into the land of Armenia.  And Esarhaddon his son reigned in his stead."
Ezra 4:2: "as ye do; and we do sacrifice unto him since the days  of Esar-haddon king of Assur, which brought us up"
Isaiah 37:38: "escaped into the land of Armenia:  and Esar-haddon his son reigned in his stead."