Apparently invented by Felice Romani in his libretto for Bellini's opera of this name (first performed in 1832). It is identical in form with Latin norma ‘rule, standard’, but there is no evidence that this word was the source of the name. In recent times, it has come to be taken in England and the Scottish Highlands as a feminine equivalent of Norman.
English: of uncertain origin. Most probably a habitational name from Shocklach in Cheshire, named in Old English with sceocca ‘goblin’, ‘evil spirit’ + læcc ‘boggy stream’. In the 17th century, the name was most common in Buckinghamshire, England.