>
Across the world, Koster (Koster , Custor , Costre ) is quite a rare epicene forename. The given name Koster is characteristic of Western Asia, particularly Oman, where it is quite a rare largely male, but uncommonly girly name, Qatar, where it is quite a rare masculine name, and Bahrain. Measured by absolute frequency, the name is most common in Bangladesh, Saudi Arabia, and Ethiopia. More frequently, Koster is the last name as well as the forename.
Koster is also a name for the fictitious and mythical characters: .