Family name 博信 (Hironobu 
, 博信 ) , across the world, is a rare last name. The family name 博信 is characteristic of Japan, where it is a rare surname, Singapore, and Cambodia, where it is a very rare surname. Not in comparison with a country's population, the name is most common in China, Japan, and Singapore. Also, 博信 is the forename as well as the last name.