In all the world, Gilby (Gilby 
, Гилби) is a rare unisex forename. The first name Gilby is characteristic of Indonesia, where it is a rare epicene name, Philippines, where it is a very rare mostly boy's, but seldom girly name, and the United States, where it is an extremely rare primarily male, but very seldom feminine name. More prevalently, Gilby is the last name as well as the forename.