hræfn

Old English hræfn descends from Proto-Germanic *hrabnaz, which may trace to Proto-Indo-European *ker-, meaning 'to croak' or possibly *krep-, 'to grab, pluck.' Both etymologies fit. Ravens croak. Ravens also grab things — food, shiny objects, the eyes of dead animals on battlefields. The Norse associated them with both sound and theft.

In Norse mythology, Odin kept two ravens: Huginn ('thought') and Muninn ('memory'). They flew across the world each day and returned to whisper what they had seen. The raven was the bird of war, wisdom, and death simultaneously. Viking warriors carried raven banners into battle. The raven flag of Sigurd the Stout flew at the Battle of Clontarf in 1014.

Ravens held similar status in Celtic, Roman, and Native American traditions. The Tower of London has kept ravens since at least the 1600s — legend says that if the ravens leave, the kingdom will fall. Charles II formalized the practice. Today, six ravens are maintained by a dedicated Ravenmaster, with their flight feathers trimmed to prevent escape.

English raven has barely changed in a thousand years — hræfn to raven is one of the most stable word-forms in the language. The bird itself is equally persistent. Common ravens (Corvus corax) are found across the entire Northern Hemisphere. They are among the most intelligent birds ever studied, capable of tool use, planning, and apparent play. Odin chose well.