Jehovah
LORD (Jehovah) — the covenant name, "I AM" / He who is
The sons of Judah; Er, and Onan, and Shelah: which three were born unto him of the daughter of Shua the Canaanitess. And Er, the firstborn of Judah, was evil in the sight of the LORD; and he slew him. 1 Chronicles 2:3
The LORD here is Jehovah acting as judge over His covenant family. Latter-day Saints understand Jehovah to be the premortal Jesus Christ.
How we know: Jehovah is the premortal Christ (Abraham 1:16; D&C 110:3–4)
