Why was the Hijri year called by this name?
The answer is: The Prophet Muhammad and his followers migrated from Mecca to Yathrib (now Medina).
The Hijri year is named after the Holy Prophet Muhammad, may God bless him and grant him peace, and his migration from Mecca to Medina. This event is considered the most prominent event in the history of the Islamic nation. Caliph Omar bin Al-Khattab, may God be pleased with him, chose him after consulting his honorable companions. It represents an important milestone in Muslim history and is used to commemorate the Prophet’s migration. The Hijri calendar is believed to have originated in the third year of the Islamic era and has been an important part of Islamic culture ever since.