Cortés mentions Malinche/Marina only twice in all of his lengthy letters. In his second letter, he doesn't even name her, merely calls her an Indian woman, who served as an interpreter. In his fifth letter, he names here, but does not show that much interest in her. Regardless of the primary source you read, you will see that the indigenous people of Mexico uniformally called Cortés Malinche after the name of his interpreter. No one made any comment about that.