Is it common for people to have hemophilia b?

No. it is rare: Hemophilia b, a congenital bleeding disorder, only in males occur at a frequency of 1 in 25, 000 males. It is far less common than hemophilia a. The bleeding symptoms are the same for both hemophilia a and b. The diagnosis should be made by a hematologist. There has been much improvement recently in the treatment and prevention of bleeding and thus all patients should be treated at hemophilia cent.