Probably from garar; a rolling country; Gerar, a Philistine city -- Gerar.
see HEBREW garar
H1642. Gerar
גְּרָר proper name, of a location south of Gaza, usually identified with modern Umm Jerâr BdPal 159 GuérinJudée ii. 257 ff.; but Wady Jer¥r west of ±Ain †ad£s according to TrumbullKadesh Barnea 61 ff. compare GutheZPV viii 1885, 215; Genesis 20:2; 26:6, 20, 26; 2 Chronicles 14:12; 14:13; גְּרָ֫רָה Genesis 10:19, 26:1; גְּרָר נַ֫חַל 26:17; בִּגְרָר וַיָּגָר 20:1.
גרשׂ (Arabic bray, pound, grind, coarse, Aramaic גְּרַס (rare) crush, , crushed, crush, destroy; compare following).