This animal was traditionally called a 'vole-mouse' (that is, a 'field mouse'), but over time the 'mouse' part of its name was lost, so that the vole was left with a name that literally means 'field'.
Related to the Old Norse völlr or 'field' that gave the vole its name was Old English wald for an area of wild land. From that came the name Wold for an untamed region of the land of Rohan, which therefore, by a circuitous linguistic route, shares its distant origins with the word 'vole'.
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