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Surname Gilby (Gilby
, Гилби) , in all the world, is quite a rare last name. The surname Gilby is characteristic of Australia, where it is quite a rare surname, the United Kingdom, where it is a rare surname, and New Zealand. In absolute terms, this name is the most popular in the United Kingdom, Australia, and the United States. Very seldom, Gilby is the forename as well as the last name.