'Firstborn Son' in the Bible

Ishmael's firstborn son was Nebaioth; the others were Kedar, Adbeel, Mibsam,

His firstborn son was Abdon, followed by Zur, Kish, Baal, Nadab,

Mattithiah, a Levite, the firstborn son of Shallum the Korahite, was in charge of baking the bread for offerings.

His firstborn son was Abdon, followed by Zur, Kish, Baal, Ner, Nadab,