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Surname Pentecost (Pentecost ) , in the world, is quite a rare last name. The family name Pentecost is habitual in New Zealand, where it is quite a rare surname, Australia, where it is a rare surname, and the United States. Not in comparison with a country's population, the name is most common in the United States, the United Kingdom, and Australia. Much less frequently, Pentecost is the forename as well as the last name.