Why are Hungarians also called Magyars?

The term Magyar is the name that Hungarians use to refer to themselves and their language. It was historically the name of one of the seven tribes that formed the federation of peoples who settled in the Carpathian Basin in the late 9th century.123

In contrast, the name "Hungarian" is an exonym—a name given by outsiders. It is derived from the term On-Ogur, which means "Ten Arrows" or "Ten Tribes." This was the name of an early Turkic tribal confederation that the Magyars joined during their westward migrations. Neighboring populations adopted this term to describe the federation, and it eventually evolved into the various European names for the country and its people (such as Hungrois or Ungar). The "H" was later added to the name "Hungarian" due to a historical misconception that the people were descendants of the Huns, a connection that is not supported by their actual linguistic or ethnic origins.31