Komentarz do Rodzaju 11:9

ומשם הפיצם AND FROM THENCE DID THE LORD SCATTER THEM —This teaches that they have no portion in the world to come (Sanhedrin 107b). Which sin was greater: that of the generation of the Flood or that of the generation of the Dispersion? The former did not stretch forth their hands against God; the latter did stretch forth their hands against God to war against him (surely, then, the sin of the generation of the Dispersion was greater) and yet the former (the generation of the Flood) were drowned and these did not perish from the world! But the reason is that the generation of the Flood were violent robbers and there was strife among them, and therefore they were destroyed; but these conducted themselves in love and friendship, as it is said, “They were one people and had one language”. — You may learn from this how hateful to God is strife and how great is peace (Genesis Rabbah 38:6).

They called the unfinished city בבל as a reminder of the fact that this was where G’d had mixed up their languages resulting in their dispersal.
ומשם הפיצם, and from there G’d had set in motion their dispersal and the division into 70 languages. The people remaining in Babylon spoke one language. Seeing that the mixing up of the languages had commenced there, this is the city that was named to commemorate this event. The one giving this name spoke Hebrew, i.e. the original holy tongue. Both the words בבל and בלל are Hebrew words. Actually, we would have expected the Torah to write ballel, instead of ballal, however the word is a condensation of the two words בא בל. We have similar condensed words called קן, חן, מן, all of which are condensed forms of such words as קנן, or חנן.

כל הארץ, a reference to the nations of the earth nowadays, i.e. the time when the Torah was being written.

'הפיצם ה, as we explained on verse 8.