Cal has been dealing with Tony for hours now, a long rambling intermittent conversation that has sometimes touched on the day's events and sometimes strayed as far away as possible, and he's been stepping carefully, doing his best to gauge what's okay to talk about when. To gently guide things along, but let Tony decide what to pick up on for himself.

He hasn't quite dropped out of that mindset yet and so, after Sherlock's hesitation has gone on for a few extra seconds, he fills the silence himself, his tone mild and his gaze off somewhere ahead of them.

"I asked Jarvis a while ago if he'd been named after anyone and he said no. I haven't been able to figure out how to make that fit."

It's a starting point, if Sherlock chooses to take it. If he needs it.