There's a lot he could say, here.

Like, Ah, good, a much less cloyingly insipid name; well done, her.

Like, It's a very pretty name.

Like just repeating it — but he knows the look of a man who absolutely does not want a specific name to be in his mouth; he doesn't say it.

Only: "I'm sure," because he isn't God to offer the eternally obnoxious 'not if I see you first' — and then picks up the rejected tea, and takes a sip, letting Palamedes leave without further objection.