That child — a boy — was born back in February. We now know Clay named his kid Clay because… of course he did. Clay Matthews III named his boy Clay Matthews IV.
We also know, courtesy of the Packers website (via TO), that Matthews and Noble are now married.
It says, “Married, wife’s name is Casey…The couple has a son, Clay IV.”
This probably wouldn’t be terribly notable except for its secrecy. And the fact that Noble was married before and her relationship with Clay was on and off until she showed up pregnant.