David uses a question emphasize that there is no other nation like Israel. Alternate translation: "There is no nation like your people Israel, the one nation on earth whom you, God, went and rescued for yourself." (See: [[rc://en/ta/man/translate/figs-rquestion]])
Here "name" represents Yahweh's reputation. Alternate translation: "to make all people know who you are" (See: [[rc://en/ta/man/translate/figs-metonymy]])