for the person, when he is alone by himself does not need a name, he only needs it for other to call him by name.
Similarly, the sparks of Tohu took on an identity once they became separated from their source, since, in their source there is no need for any name, like a person does not need a name in himself.
Once these sparks were retrieved and elevated, thereby becoming completely included in their source in Elokus, they have no unique names of their own.
They are, therefore, referred to then as “צִּבְּאוֹּתַַַׁׁׁהֲוָּיָּ''ה-the multitude of sparks belonging to Havaya,” for they lose their own identity, being completely included in the Name הֲוָּיָּ''ה of Atzilus.
Now we can also explain the meaning of the verse: “Hashem took the Jewish people out of Egypt ‘ע לַַׁׁצִּבְּאֹּתָּםַׁ-above their multitudes [of sparks],’” meaning, that the Jewish people themselves were on a higher level than that of the sparks of Tohu that they elevated, as explained above.
The Mittler Rebbe explains: These sparks of Tohu that fell down into the worlds of BY”A became elevated to the level of the Name צְבָאוֹת, which is related to the elevation of the Keilim of BY”A and the multitudes of creations connected to them to Elokus. However, this is only the level of Malchus that descends into BY”A, into the Keilim of the Sefiros of BY”A, as explained above.
However, the Jewish people themselves were elevated by Moshe Rabeinu to his own level of Atzilus itself. Only the Eirev Rav remained on the level of BY”A, the regular Jewish people actually reached a level similar to Moshe, because of their strong connection to him.
In other words, when the Jewish people left Egypt, they weren’t only the “Army of Hashem,” they reached the level of prophets of Hashem, who experience Hashem directly and fully, just like in the world of Atzilus.