Exodus 6:3

Overview - Exodus 6
God renews his promise by his name JEHOVAH.
Moses vainly attempts to encourage the Israelites.
10 He and Aaron are again sent to Pharaoh.
14 The genealogy of Reuben, of Simeon, and of Levi, of whom came Moses and Aaron.
26 The history resumed.
Treasury of Scripture Knowledge

Exodus 6:3  (King James Version)
And I appeared unto Abraham, unto Isaac, and unto Jacob, by the name of God Almighty, but by my name JEHOVAH was I not known to them.

God Almighty
{El shadday,} God Almighty; for {shadday} is evidently of affinity with the Arabic {shadid,} strong, mighty, and {shiddat,} strength, might; so the LXX. in Job render it
[panto krator,] Vulgate, in Pentateuch, {Omnipotens,} and
Syriac, in Job, {chasino.} Genesis 17:1 ; 28:3 35:11 48:3

but by my name
If Abraham, Isaac, and Jacob, did not know the name Jehovah, then Moses must have used it in Genesis by prolepsis, or anticipation
Mr. Locke and others read it interrogatively, for the negative particle, {lo,} not, has frequently this power in Hebrew: "I appeared unto Abraham, Isaac, and Jacob, by the name of God Almighty, and by my name Jehovah was I not also made known unto them?"

3:14 Genesis 12:7 Genesis 12:8 ; 13:18 22:14 Psalms 68:4

Psalms 83:18 ; Isaiah 42:8 ; 44:6 Isaiah 52:5 Isaiah 52:6 John 8:58 ; Revelation 1:4