The word "Surbet" is typically spelled with a "u" after the "s", but it can also be spelled with an "e" after the "s". This variation in spelling is due to its origin as a loanword from English to Swedish. In English, the vowel sound in "Sur" is pronounced as [ɜː], whereas in Swedish it is pronounced as [ʉː]. Therefore, the "u" spelling reflects the Swedish pronunciation, while the "e" spelling corresponds more closely to the English vowel sound.
The word Surbet is derived from the Old French term sorbet, which originated from the Latin word sorbere meaning to suck. In the Middle Ages, sorbet referred to a type of sweetened fruit juice or flavored water that was served as a refreshing drink. Over time, the term sorbet evolved into surbet, which ultimately became the modern English word sherbet.