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Cognomen Коя (Koya , 古家 , 古屋 ) , globally, is a common surname. The surname Коя is habitual in United Arab Emirates, where it is quite a common surname, Fiji, and Qatar (explore the name in all countries). Measured by absolute frequency, this name is the most popular in India, Iraq, and Saudi Arabia. Very seldom, Коя is the forename as well as the last name.