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Surname Haggai (Haggai , חגי , ハガイ ) , all around the world, is quite a rare cognomen. The family name Haggai is habitual in Israel, where it is quite a rare surname, Namibia, and Kenya. Measured by absolute frequency, this name is the most popular in Nigeria, Kenya, and Israel. More prevalently, Haggai is the forename as well as the last name.