Biography of Zerah

1 Chronicles 2

3 The sons of Judah; Er, and Onan, and Shelah: which three were born unto him of the daughter of Shua the Canaanitess. And Er, the firstborn of Judah, was evil in the sight of the LORD; and he slew him.

4 And Tamar his daughter in law bore him Pharez and Zerah. All the sons of Judah were five.

1 Chronicles 2

1 These are the sons of Israel; Reuben, Simeon, Levi, and Judah, Issachar, and Zebulun...

6 And the sons of Zerah; Zimri, and Ethan, and Heman, and Calcol, and Dara: five of them in all.

1 Chronicles 9

3 And in Jerusalem dwelled of the children of Judah, and of the children of Benjamin, and of the children of Ephraim...

6 And of the sons of Zerah; Jeuel, and their brothers, six hundred and ninety.

Nehemiah 11

23 For it was the king's commandment concerning them, that a certain portion should be for the singers, due for every day.

24 And Pethahiah the son of Meshezabeel, of the children of Zerah the son of Judah, was at the king's hand in all matters concerning the people.

From Wikipedia

According to the Book of Genesis, Zerah was the son of Tamar and of Judah, and was the twin of Pharez. The text argues that he was called Zerah because he had stuck his hand out before being born, and the midwife had tied a scarlet thread; although all other biblical uses of the word zerah translate as sunrise, here the name is implied to derive from the colour of the thread - scarlet - which is similar to the initial colour of sunrise.

According to biblical scholars, the birth narrative here is an eponymous aetiological myth concerning the ethnological relationship between parts of the tribe of Judah. The narrative would be more appropriate for describing the birth of Shuni (שוני), one of the sons that the Bible later attributes to Gad, since the word used for scarlet is shani (שני); in addition, the bible also identifies Zerah as the name of the founder of one of the Simeonite clans.