'Name of the Lord' in the Bible

Then David said to the Philistine, You come to me with a sword and a spear and a javelin: but I come to you in the name of the Lord of armies, the God of the armies of Israel on which you have put shame.

And Jonathan said to David, Go in peace, for we two have taken an oath, in the name of the Lord, saying, The Lord will be between me and you, and between my seed and your seed for ever. Then David went away, and Jonathan went into the town.