Family name বিল্লাহ (Billah 
, বিল্লাহ ) , across the world, is a common last name. The last name বিল্লাহ is characteristic of Bangladesh, where it is quite a common surname, Qatar, where it is quite a rare surname, and Brunei. In absolute terms, it most frequently occurs in Bangladesh, Indonesia, and Pakistan. Much less frequently, বিল্লাহ is the forename as well as the last name.