What is the significance of a register of the peoples?
The basic meaning is that God knows who are his and not one of them will perish (e.g., Exodus 32:32; Psalm 69:28; Psalm 139:16; Revelation 17:8; Revelation 21:27). The idea of a register of peoples recalls Ezekiel 13:9.1
6 The LORD records as he registers the peoples, “This one was born there.” Selah