Ehm sodium is the odd one out here, I believe only english (both of them) does not use the word natrium, other languages do. And yes not mercury but a translation of quicksilver is used in other languages, and kalium not potassium. When someone says oxygen, do you say they speak latin? They are just the names for the elements, they are, what they are called. A few just deviate from how it is written in other language (i.e. remained their original name)