The plural form of "elf" is "elves". The word "elf" is actually the plural form of the Old English word "alfr", which means "white one" or "spirit". The word "elf" has been used in various languages over the centuries to refer to small, magical beings who are often associated with nature and the supernatural. In modern times, the term "elf" has become synonymous with the mythical creatures found in the stories of Santa Claus and the North Pole.