What is the meaning of Pio?

Chicken.

pi

first-person singular present indicative of piar

pious, devout, prayerful

charitable

tweet, chirp (the cry of birds)

to appease, propitiate

to purify, expiate

dative/ablative masculine/neuter singular of pius

pious

compassionate

chirp (sound emitted by chicks)

peep (a feeble utterance or complaint)

first-person singular present indicative of piar

the cry made by an oriole

third-person singular preterite indicative of piar

Source: wiktionary.org