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In the speech of Devon, Somerset, and Cornwall, counties of southern England, words that begin with the voiceless fricative sounds (f) and (s) are pronounced instead with voicing, as (v) and (z).
Vixen, finally, represents the southern pronunciation of a word that goes back to Old English fyxe, the feminine of fox.
It was formed by a change in the root vowel of fox and the addition of a suffix e or en.