John Gill Commentary 1 Chronicles 2:33

"And the sons of Jonathan: Peleth, and Zaza. These were the sons of Jerahmeel." — 1 Chronicles 2:33 (ASV)

And the sons of Jonathan; Peleth and Zaza
Of whom no mention is made elsewhere:

these were the sons of Jerahmeel ;
not only his immediate sons, but their posterity, called from him Jerahmeelites, (1 Samuel 27:10) .