Fjörgyn is a Norse earth goddess, named as Thor’s mother in several Eddic poems. She embodies the fertile land and is often synonymous with Jörð. Though rarely detailed, Fjörgyn represents the grounding, nurturing force of nature. Poets invoke her to connect thunder (Thor) with the earth, symbolizing the interplay between sky and soil, power and sustenance, in the natural world.

Fjörgyn is primarily known as the mother of Thor and is often equated with Jörð (Earth). Her name appears in kennings like "Fjörgyn’s son" for Thor, especially in Hymiskviða and other eddic poems. The term may originate from a Proto-Germanic earth goddess (*Fergunja), possibly linked to mountainous or wooded landscapes. Students should note that Fjörgyn is grammatically feminine, distinguishing her from Fjörgynn (masculine), father of Frigg. This duality reflects Norse linguistic gender patterns and the mythological pairing of earth and sky. Fjörgyn’s role is largely genealogical, but her association with Thor roots his power in the terrestrial realm—contrasting with his father Odin’s celestial domain. Understanding Fjörgyn helps decode Thor-centric kennings and earth symbolism in Norse poetry.