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Cognomen Ō (Oo , Oh , О ) , worldwide, is a prevalent last name. The family name Ō is habitual in South-eastern Asia, particularly Myanmar, where it is a prevalent surname, Malaysia, where it is a common surname, and Singapore (explore the name in all countries). Not in comparison with a country's population, the name is most common in Myanmar, Malaysia, and Egypt. Very seldom, Ō is the forename as well as the last name.