Charles Ellicott Commentary 2 Samuel 2:16

"And they caught every one his fellow by the head, and [thrust] his sword in his fellow`s side; so they fell down together: wherefore that place was called Helkath-hazzurim, which is in Gibeon." — 2 Samuel 2:16 (ASV)

Helkath-hazzurim is interpreted in the margin “the field of strong men,” but the etymology is very doubtful. Most modern expositors understand it as meaning “the field of sharp edges.”