Family name キルビー (Kilby 
, キルビー) , around the globe, is quite a common last name. The last name キルビー is habitual in Australia, where it is quite a rare surname, the United Kingdom, and New Zealand. Not in comparison with a country's population, it is commonest in the United States, the United Kingdom, and Australia. Much less frequently, キルビー is the forename as well as the last name.