Maununo was a suco that consisted of only three villages during the Indonesian occupation. The population of Maununo is 60% Tetun, 30% Bunak and 10% Mambai. In Suco Cassa the Bunak people form 55% of the population, followed by the Tetun and a small minority of Mambai. Even in Fohoailiku the Bunak people represent the majority. According to oral traditions, the Bunak people of Fahoailiku originated from western Ainaro, which they left due to conflicts with other Bunak groups during the Portuguese colonial period. The linguistic characteristics of the three Bunak groups in Ainaro suggest a common origin.