Psalm 54

Ziph was a town on the southern edge of the Judean highlands, and the wilderness named after it is bare steppe falling away toward the Dead Sea — thin soil, scattered caves, almost no water. It was good country to disappear in and terrible country to live in.

The men who turned David in were Judahites. Ziph was in his own tribe's territory, and twice its people sent word to Saul about where he was camped. When the psalm complains that strangers have risen up against him, some Hebrew copies read insolent men instead; either way the sting is that his own tribe played the part of foreigners.

The freewill offering he promises at the end was a specific kind of gift. Unlike a vow, which was owed, or a sin offering, which was required, the freewill offering came out of gratitude and surplus. He is promising the offering you bring when nobody made you.

Save me by thy name is not a formula. In that world a name carried the person's reputation and record. To be saved by God's name is to be saved by everything God has already shown himself to be.