Pronunciation: Thyalf-ee
Servant of Thor. Thjalfi was best known as a remarkably swift runner. The name (Old Norse Þjálfi) has been interpreted as “serving-elf,” but also appears as a personal name. His sister’s name, Old Norse Röskva, is related to the verb “to grow, to mature,” and may hint at an original role as fertility goddess, fitting to both Thor’s role as a god of fruitfulness and to the character of his wife Sif.