'First born' in the Bible

And Canaan begat Zidon his first born, and Heth,

These are their generations: first-born of Ishmael, Nebaioth, and Kedar, and Adheel, and Mibsam,

Sons of Judah: Er, and Onan, and Shelah, three have been born to him of a daughter of Shua the Canaanitess. And Er, first-born of Judah, is evil in the eyes of Jehovah, and He putteth him to death.

and Jesse begat his first-born Eliab, and Abinadab the second, and Shimea the third,

And sons of Jerahmeel, first-born of Hezron, are: the first-born Ram, and Bunah, and Oren, and Ozem, Ahijah.

And sons of Ram, first-born of Jerahmeel, are Maaz, and Jamin, and Eker.

And sons of Caleb brother of Jerahmeel: Mesha his first-born, he is father of Ziph; and sons of Mareshah: Abi-Hebron.

These were sons of Caleb son of Hur, first-born of Ephrathah: Shobal father of Kirjath-Jearim,

And these were sons of David, who were born to him in Hebron: the first-born Amnon, of Ahinoam the Jezreelitess; second Daniel, of Abigail the Carmelitess;

And sons of Josiah: the first-born Johanan, the second Jehoiakim, the third Zedekiah, the fourth Shallum.

and Penuel is father of Gedor, and Ezer father of Hushah. These are sons of Hur, first-born of Ephratah, father of Beth-Lehem.

As to sons of Reuben, first-born of Israel -- for he is the first-born, and on account of his profaning the couch of his father hath his birthright been given to the sons of Joseph son of Israel, and he is not to be reckoned by genealogy for the birthright,

Sons of Reuben, first-born of Israel: Hanoch, and Pallu, Hezron, and Carmi.

And sons of Samuel: the first-born Vashni, and the second Abijah.

And Benjamin begat Bela his first-born, Ashbel the second, and Aharah the third,

and his son, the first-born, is Abdon, and Zur, and Kish, and Baal, and Nadab,

And sons of Eshek his brother: Ulam his first-born, Jehush the second, and Eliphelet the third.

And of the Shilonite: Asaiah the first-born, and his sons.

And Mattithiah, of the Levites (he is the first-born to Shallum the Korahite), is in office over the work of the pans.

and his son, the first-born, is Abdon, and Zur, and Kish, and Baal, and Ner, and Nadab,

and to Meshelemiah are sons, Zechariah the first-born, Jediael the second, Zebadiah the third, Jathniel the fourth,

And to Obed-Edom are sons, Shemaiah the first-born, Jehozabad the second, Joah the third, and Sacar the fourth, and Nethaneel the fifth,

and to Hosah, of the sons of Merari, are sons: Shimri the head (though he was not first-born, yet his father setteth him for head),