Eddy is a diminutive form of the names Edward and Edmund, as well as other names beginning with 'Ed'. It is commonly used as a given name and surname. The name has historical roots in English, Irish, and Scottish families. In fluid dynamics, 'eddy' refers to the swirling of a fluid and the reverse current created when the fluid flows past an obstacle. The term is also used in electromagnetism to describe loops of electric current induced within conductors by a changing magnetic field.