Is the word 'hex' commonly used in British English?
I'm just curious. I'm from Pennsylvania, and my understanding is that the word "hex" was adopted in American English from Pennsylvania Dutch, an obscure dialect of German spoken in the Mid-Atlantic and Midwestern parts of the United States (formerly by a large population of German immigrants and their descendants in the 1700s and 1800s, but today only by the Amish and Mennonites).
"Hexe" meaning "witch" also exists in modern, mainstream German, so either the term in British English either derived separately from the term in American English, or the word was loaned directly from American English. If the latter is true, I find it very cool that a word that originated in my humble little state is the title of a popular series in the UK!