From Old Norse and Germanic roots meaning masked, fierce, or resolute; also used as a byname of Odin.
Grim is one of the oldest documented names in the Norse and Germanic world, derived from Old Norse 'grímr,' meaning 'masked one' or 'the helmeted.' Its most significant bearer in mythology is Odin himself — Grim or Grimnir was among the Allfather's dozens of heiti (poetic bynames), used when the god walked among mortals in disguise. The Eddic poem Grímnismál opens with Odin imprisoned, shrouded and unrecognised, speaking the poem's wisdom from behind his mask — making Grim a name saturated with themes of hidden knowledge, tested endurance, and revealed power.
Historically the name was widespread across Scandinavia, Iceland, and Anglo-Saxon England, leaving its mark deeply in place names: Grimsby (Grim's settlement) in Lincolnshire is one of the most prominent, and Grimsdyke and Grims Ditch appear across southern England, some possibly referring to Woden/Odin's earthworks. Icelandic sagas record numerous chieftains and settlers named Grimr, and it survived in active use well into the medieval period. The legendary figure of Kraki's saga and various Viking-age inscriptions further cement its long history as an actual given name rather than merely a mythological epithet.
In the modern era Grim carries the appealing tension of a name that sounds fierce on the surface — English speakers hear 'grim' as stern or foreboding — yet carries deep mythological poetry beneath. In Scandinavian countries it has seen modest revival as part of broader interest in Norse heritage names. For parents drawn to names with genuine historical teeth and no modern competition, Grim is remarkably uncommon for a name so ancient.