proper noun/kaˈʝao/
a town and port in Callao, Callao, in the central west of Peru, near Lima; a province of Callao, Peru, whose capital is Callao; a region of Peru, containing only the province of Callao; several places in South America outside of Peru; several places in Spain
From callao (“stone pebble beach”). Most places in Spain, South America and the United States are named after the Callao in Peru.