John Gill Commentary 1 Chronicles 9:6

"And of the sons of Zerah: Jeuel, and their brethren, six hundred and ninety." — 1 Chronicles 9:6 (ASV)

And of the sons of Zerah
Another son of Judah:

Jeuel, and their brethren; six hundred and ninety ;
or their kinsmen; for this number includes all of the posterity of Pharez, Shelah and Zerah mentioned.