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English word po comes from Old French poue, Latin pavonis, and later Proto-Germanic *pāwô (Peacock, peafowl.)
poue (Old French)
pavonis (Latin)
*pawô (Proto-Germanic)
*pāwô (Proto-Germanic)
Peacock, peafowl.
pái (Old Norse)
Peacock.
pēa (Old English)
pawe (Middle English)
po (English)
(obsolete) A peacock.