It is believed that Chief Coroo headed the first clan of Agat. Beloved by his people, he was also the eldest in the clan. Chief Coroo divided the village into families, each with its own surname.
Chalan Pago is a Chamorro word that means “Pago Road.” Chalan Pago referred to the area traveled through to get from Hagåtña to Pago, which may lend to the naming of the area, which is covered with Pago trees (hibiscus tiliaceus).