'First born' in the Bible

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

These are their genealogies: the firstborn of Ishmael was Nebaioth, then Kedar, Adbeel, Mibsam,

The sons of Judah were Er, Onan and Shelah; these three were born to him by Bath-shua the Canaanitess. And Er, Judah’s firstborn, was wicked in the sight of the Lord, so He put him to death.

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

Now the sons of Jerahmeel the firstborn of Hezron were Ram the firstborn, then Bunah, Oren, Ozem and Ahijah.

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

Now the sons of Caleb, the brother of Jerahmeel, were Mesha his firstborn, who was the father of Ziph; and his son was Mareshah, the father of Hebron.

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

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

The sons of Josiah were Johanan the firstborn, and the second was Jehoiakim, the third Zedekiah, the fourth Shallum.

Penuel was the father of Gedor, and Ezer the father of Hushah. These were the sons of Hur, the firstborn of Ephrathah, the father of Bethlehem.

Now the sons of Reuben the firstborn of Israel (for he was the firstborn, but because he defiled his father’s bed, his birthright was given to the sons of Joseph the son of Israel; so that he is not enrolled in the genealogy according to the birthright.

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

The sons of Samuel were Joel the firstborn, and Abijah the second.

And 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 were Ulam his firstborn, Jeush the second and Eliphelet the third.

From the Shilonites were Asaiah the firstborn and his sons.

Mattithiah, one of the Levites, who was the firstborn of Shallum the Korahite, had the responsibility over the things which were 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 (although he was not the firstborn, his father made him first),