As you know that It's a messaging service. That means people use it to communicate. The word babble, although oft used pejoratively, does means to talk rapidly and continuously. Then you have the word Babel which comes from the biblical story of the infamous tower in Babylon. I think it's highly likely it's a combination of both uses and not someone at Google spelling it wrong. Hearing it wrong in church makes no sense since both are homonyms |ˈbabəl| in modern English.chromaniac said:Personally, I do not think Babble would be the brand name.
https://play.google.com/store/apps/details?id=com.google.android.apps.babel