Lewis & Short

1. pāpa (pappa), ae, f. [onomatopoeia], the word with which infants call for food: cum cibum ac potionem buas ac papas vocent, Varr. ap. Non. 81, 4.

2. pāpa, ae, m. [onomatopoeia], a father, papa; hence, in eccl. writers, a bishop: optime papa, Prud. στεφ. 11, 127; Tert. Pudic. 13.

3. Papa, a Roman surname, Inscr. Don. Cl. 7, n. 32.