Hazel is a nature name, referring to the Hazel tree. It’s from the Old English word, hæsel. It was originally used as a habitational surname for people who lived by a hazel tree, dating back to the 12th century.
Famous people named Hazel include Hazel Mae Clark (athlete), Hazel Blears (British politician), Hazel Perfect (British mathmetician), Hazel O'Leary (former United States Secretary of Energy), and Hazel Mae Gagulada (Canadian sportscaster). Fictional characters named Hazel include Hazel the maid from the 1960s t.v. show of the same name, and Hazel Grace Lancaster, the main character from the novel and movie, The Fault in Our Stars by John Green. Hazel is also the name of the main rabbit in Watership Down by Richard Adams.