Last name Гилби (Gilby 
, Гилби) , all around the world, is quite a rare cognomen. The family name Гилби is habitual in Australia, where it is quite a rare surname, the United Kingdom, where it is a rare surname, and New Zealand. Not in comparison with a country's population, the name is most common in the United Kingdom, Australia, and the United States. Very seldom, Гилби is the forename as well as the last name.