Lahmi was Goliath's brother and, like Goliath, was a giant.
2 Sam 21:19In another battle with the Philistines at Gob, Elhanan son of Jare-Oregim the Bethlehemite killed Lahmi the brother of Goliath the Gittite, who had a spear with a shaft like a weaver’s rod.
1 Chr 20:5In another battle with the Philistines, Elhanan son of Jair killed Lahmi the brother of Goliath the Gittite, who had a spear with a shaft like a weaver’s rod.