Jehovah
Jehovah (LORD) — the covenant name, "I AM" / "He who is"
When I shall make the land of Egypt desolate, and the country shall be destitute of that whereof it was full, when I shall smite all them that dwell therein, then shall they know that I am the LORD. Ezekiel 32:15
Through the whole chapter the LORD, Jehovah, speaks and judges the proud nations so that all will know He is God. Latter-day Saints know Jehovah as the premortal Jesus Christ, the God who rules over the nations.
AttestedJehovah — the LORDA divine name
How we know: the verse itself names Him