'First born' in the Bible

Canaan became the father of Sidon his firstborn, and Heth,

These are their descendants: The firstborn of Ishmael, Nebaioth; then Kedar, Adbeel, Mibsam,

Jesse became the father of Eliab his firstborn, Abinadab the second, Shimea the third,

The sons of Jerahmeel the firstborn of Hezron: Ram the firstborn, Bunah, Oren, Ozem, and Ahijah.

The sons of Ram the firstborn of Jerahmeel were: Maaz, Jamin, and Eker.

The sons of Caleb, the brother of Jerahmeel: Mesha his firstborn was the father of Ziph; and his son Mareshah was the father of Hebron.

These were the sons (descendants) of Caleb.The sons of Hur, the firstborn of Ephrathah: Shobal the father of Kiriath-jearim,

These were the sons of David who were born to him in Hebron: the firstborn was Amnon, by Ahinoam the Jezreelitess; second, Daniel (Chileab), by Abigail the Carmelitess;

The sons of Josiah: firstborn, Johanan; second, Jehoiakim (Eliakim); third, Zedekiah; fourth, Shallum (Jehoahaz).

Now [we come to] the sons of Reuben the firstborn of Israel—for Reuben was the eldest, but because he defiled his father’s bed [with Bilhah his father’s concubine], his birthright was given to [Manasseh and Ephraim] the sons of Joseph [the favorite] son of Israel, so that he is not enrolled in the genealogy according to the birthright.

the sons of Reuben the firstborn of Israel: Hanoch, Pallu, Hezron, and Carmi.

The sons of Samuel: Joel the firstborn and Abijah the second.

Benjamin became the father of Bela his firstborn, Ashbel the second, Aharah the third,

and his firstborn son was Abdon, then Zur, Kish, Baal, Nadab,

The sons of Eshek his brother: Ulam his firstborn, Jeush the second, and Eliphelet the third.

From the Shilonites: Asaiah the firstborn and his sons.

Mattithiah, one of the Levites, the firstborn of Shallum the Korahite, was responsible for the things baked in pans.

and his firstborn son was Abdon, then Zur, Kish, Baal, Ner, Nadab,

Meshelemiah had sons: Zechariah the firstborn, Jediael the second, Zebadiah the third, Jathniel the fourth,

Obed-edom had sons: Shemaiah the firstborn, Jehozabad the second, Joah the third, Sacar the fourth, Nethanel the fifth,

Also Hosah, one of the sons of Merari, had sons: Shimri the first and chief (although he was not the firstborn, his father made him first),