From Latin pavo 'peacock'. In Modern Spanish we can see a marking reversal in pavo real 'peacock' (lit. 'royal turkey', from 1737). Also Spanish rare pavón 'peacock'.

Also Calician pavo, pavón, Asturian, Leonese pavu 'turkey' vs. Portuguese pavão, Old Catalan pahó, Catalan paó, Aromanian pãun, pãunu, paun, paunu, Romanian păun, Italian pavone, paone, Friulian, Lombard, Occitan, Piedmontese pavon, Romansch (Rumantsch Grischun, Puter, Vallader) pavun, Romansch (Sutsilvan) pivun, French, Norman (Jersey) paon, Old French, Anglo-Norman paon,  paoun,  pavon,  pavoun;  paue; poeun,  pohoun,  pon,  poon,  pooun,  poum,  poune,  pououn,  pown 'peacock'.