Paddington Bear’s original Peruvian name in Michael Bond’s stories was Pastuso.
The name Pastuso is connected with Paddington’s life before he travels to England. After arriving in London, he is given the name Paddington by the Brown family, who name him after the station where they find him. His Peruvian background remains an important part of his identity throughout the books.
Paddington is raised by his Aunt Lucy and Uncle Pastuzo in Peru. The original stories describe his journey to Britain and his effort to adapt to a new country, language, customs, and family life. The name Pastuso is easy to confuse with Pastuzo, the name used for his uncle in the stories and films.
The distinction matters: Pastuso is Paddington’s earlier personal name, while Pastuzo is his uncle. Adaptations may give different amounts of detail about this part of his biography, but the names are not interchangeable.