How or why was hemophilia named that?

The term "hemophilia" is derived from two Greek words: "haima," meaning blood, and "philia," signifying a liking or affinity. When hemophilia was first identified and characterized in the early 19th century, it was observed that affected individuals exhibited a tendency to bleed excessively and uncontrollably. Based on this clinical observation, the condition was given the name "hemophilia," referencing the abnormal and marked affinity for bleeding (blood-loving) that afflicted individuals displayed.

Historically, hemophilia was further classified into two primary types based on the specific clotting factor deficiency responsible for the bleeding disorder. Hemophilia A was found to arise from a deficiency in clotting factor VIII, while hemophilia B was characterized by a lack of clotting factor IX. These subtypes further clarified the distinct genetic mutations responsible for each type of hemophilia. Today, the terms hemophilia A and hemophilia B, are more commonly used to refer to these bleeding disorders rather than the broad term "hemophilia."