Too bad Cruz aka Mr. Constitutional lawyer couldn’t name anybody. That’s tragic comedy. :-)
I would be interested in where Cruz was asked to name someone? You make the claim that he couldn't name someone, then would you be so kind to show where the question was even floated?
If this helps, here is the debate section in question. I don't see the question being posed at all, but perhaps you know something I don't (not that I am holding my breath).
https://www.youtube.com/watch?v=j16uMJxgCZU