Strong's #1642: Grar (pronounced gher-awr')
 probably from 1641; a rolling country; Gerar, a Philistine city:--Gerar.
Brown-Driver-Briggs Hebrew Lexicon:
 ּ 
  gerâr 
 
 Gerar = "a lodging place" 
 1) a Philistine town south of Gaza, modern ' Umm' 
 
  Part of Speech: noun proper locative
Relation: probably from H1641
Usage:
This word is used 10 times:
Genesis 10:19: "was from Sidon, as thou comest  to Gerar, unto Gaza; as thou goest,"
Genesis 20:1: "between Kadesh and Shur, and sojourned  in Gerar."
Genesis 20:2: "is my sister: and Abimelech king  of Gerar sent, and took Sarah."
Genesis 26:1: "unto Abimelech king of the Philistines  unto Gerar."
Genesis 26:6: "And Isaac dwelt  in Gerar:"
Genesis 26:17: "thence, and pitched his tent in the valley  of Gerar, and dwelt there."
Genesis 26:20: "And the herdsmen  of Gerar did strive with Isaac's saying, The water"
Genesis 26:26: "Then Abimelech went to him from Gerar,  him from Gerar, and Ahuzzath and Phichol"
2 Chronicles 14:13: "were with him pursued  Gerar: and the Ethiopians were overthrown, that they could not"
2 Chronicles 14:14: "all the cities round about  Gerar; for the fear of the LORD came"