Definition from Wiktionary, the free dictionary
Proper noun 
- (Judaism, Islam) The eldest son of Abraham and his wife's handmaiden Hagar who were cast out after the birth of Isaac; traditionally the ancestor of the Arabs.
- A male given name.
- 1611 — King James Version of the Bible, Genesis 16:15
- And Hagar bare Abram a son: and Abram called his son's name, which Hagar bare, Ishmael.
- 1851 — Herman Melville, Moby-Dick, ch 1
- Call me Ishmael.
Related terms 
eldest son of Abraham