Deliberate mistake: Throughout the first part of the movie, Tarzan and all the other animals are speaking to each other in English. After Tarzan meets Jane, he has trouble communicating with her and later shows her that he communicates with the gorillas using grunts. This means that the earlier communication between Tarzan and the animals was done for the benefit of the audience. However, with this being the case, Tarzan shouldn't have been able to tell Jane his name, since the gorillas communicate with him in grunts, they would have had no way of vocalizing a name for him that could translate into a human language. At least not until Tarzan and another human could agree on what his name should translate to.
Phaneron
3rd Jul 2020