John Gill Commentary 1 Chronicles 4:13

"And the sons of Kenaz: Othniel, and Seraiah. And the sons of Othniel: Hathath." — 1 Chronicles 4:13 (ASV)

And the sons of Kenaz
Who was either the son of Chelub, or of Eshton:

Othniel, and Seraiah ;
the first of these is he who is mentioned, (Joshua 15:17) (Judges 1:13) (3:9) and was the first judge in Israel:

and the son of Othniel, Hathath ;
and the next mentioned.