We designate the spirit of the well as 'she' because in most of her personifications she takes a female form, though not invariably. She appears in many guises - ghost, witch, saint, mermaid, fairy, and sometimes in animal form, often as a sacred fish - and her presence permeates well lore, and indeed water lore generally.

In the Scotland of the early seventeenth century, an old woman living alone in Kirkcudbrightshire was accused of witchcraft and on conviction was rolled downhill in a blazing tar barrel. One of the charges against her was that she walked withershins round a well near her cottage which was used by other people. The well was afterwards known as the Witch's Well. These episodes must surely serve as cautionary tales to anyone tempted to transgress the usual custom of walking deasil round a holy well.