Perhaps from galah; exile; Goljath, a Philistine -- Goliath.
see HEBREW galah
H1555. Golyath
גָּלְיַת proper name, masculine (conspicuous ? On ending ת compare Dr 1 Samuel 17:4 & Nö in EutNab 73) (גָּלְיָת 1 Chronicles 20:5) Philistine giant slain by David 1 Samuel 17:4, 23; 21:10; 22:10, but according to 2 Samuel 21:19 slain by Elhanan of Bethlehem (הַלַּחְמִי בֵּית; acc to 1 Chronicles 20:5 Elhanan slew לַחְמִי brother of Goliath).