TT #84 · Parashas Noach · Seventh Aliyah · Passuk 11:9
Therefore its name was called Babel, because there Hashem confused the language of the whole earth, and from there Hashem scattered them over the face of the whole earth.
Torah Temimah notes the identification of Babel with Borsif (for get validity).
E-Daf image — Yoma 10a (size=3)
English: “Its name was called Babel” — Babel is Borsif; what is the practical difference? For bills of divorce (if one writes one name or the other the get remains valid).
Custom (halakhic identification of place names).
Babel and Borsif are treated as interchangeable names for purposes of the location written in a get.