But if there was a famous guy called Congu who was so famous people had named territories elsewhere after him and he had his own clothing label to boot -- ensur

But if there was a famous guy called Congu who was so famous people had named territories elsewhere after him and he had his own clothing label to boot -- ensuring that his name was foremost in the popular psyche -- then it wouldn't change the fact that if one called 'Congo' 'Congu', one would have made a simple spelling error. If I was a resident of Congo, I would appreciate it when people corrected this error. ¯\_(ツ)_/¯