Albert Barnes Commentary 2 Samuel 5:20

"And David came to Baal-perazim, and David smote them there; and he said, Jehovah hath broken mine enemies before me, like the breach of waters. Therefore he called the name of that place Baal-perazim." — 2 Samuel 5:20 (ASV)

Baal-perazim - Master or possessor of breaches, equivalent to “place of breaches.” It was on a hill near Gibeon (see the cross-reference).