Räv is ‘fox’ Räv is a Nordic word, Icelandic refr, Old Swedish ræver, Danish ræv, Norvegian rev. The origin could be Indoeuropean *erebh, approx. ‘brown’, ‘mottled’, and related to järv ‘wolverine’, ripa ‘grouse’, järpe ‘hazel-grouse’ and rapphöna ‘partridge’.
Fox, Ducth vos and German Fuchs stem from Germanic *fuh-, and the Indoeuropean root *puk- ‘tail’ (cf Sanskrit puccha ‘tail’). No surprise - the long bushy tail is very characteristic.
This one trotted by a couple of weeks ago.
More about fox, see fogsvans .