Psalm 68: Almighty
There is all kinds of silliness out there to connect the word Almighty with Shaddai. However, it was not the translation for Shaddai at all.
But first, let's line up the words that are a translation for each other. Pantocrator was a name for God in the Septuagint. Pantocrator translates into Latin as Omnipotens, into German as Allmächtige and into English as Almighty. Almighty appeared already as a name of God in Wycliff's translation and predates it by some time.
But, here is the catch. Pantocrator was not primarily the translation for Shaddai, but for the Lord of Hosts, or Lord Sabaoth. This is the name that Robert Alter refers to as the Lord of battalions or Lord of Armies, YHWH tseva'ot. So Pantocrator was the all-powerful God, the Lord of Hosts.
The meaning of Pantocrator, all powerful, has no connection to the name Shaddai. Not that Shaddai was not all powerful, but this is not an accurate translation of the name. Shaddai was Shaddai.
Throughout the LXX Pantocrator translates the Lord of Hosts. In Genesis, Shaddai is translated simply as theos. However, in Job, Shaddai was also translated as Pantocrator. So it appears that once the name Pantocrator had already been established in other books of the LXX for Lord Sabaoth, it was then used for Shaddai in Job.
Now it makes sense. Pantocrator, all powerful, the Lord of Hosts.
However, in the Vulgate, another twist, most references to both Shaddai and Lord of Hosts were translated as Omnipotens, all powerful. And finally, in the English, Lord Sabaoth was translated Lord of Hosts and only Shaddai was translated Almighty. This is the short story of how Shaddai came to be Almighty in English.
But, just to make this more confusing, in Isaiah 9:6, the Mighty God, is a translation of a completely different word, El Gibbor - God the mighty (hero).
I will have to write about how Shaddai was translated in Psalm 68 next time. Sometimes there are just too many twists and turns.
I almost forgot to mention that Pantocrator was a title for Zeus, and also associated with Apollo, the sun god. So we see Jesus Pantocrator portrayed as a sun god in some early Christian and even later Byzantine art. Pantocrator was not a name that was invented to translate Lord of Hosts, it already existed as a title for a god in Greek.
I realize that as Christians we might be very attached to the name Almighty for God, but in a translation, I find Shaddai and Lord of Hosts or Armies more in character with the Hebrew.