Harmless divination, she'll give him the benefit of the doubt on. Which is to say she'll roll her eyes and argue statistics, but won't stop him if he's enjoying himself. The bigger issue is whether he really wants to know, more than she wants to not know.

"I like that," is the right place to start. If it's a girl-- and there's a part of her that hopes it is-- she'd have asked if he wanted to call her Sam, or if it would be too painful, but a middle name seems about right. I chose William so early, she can't say. Because I knew you'd have argued if I tried to call him Fox, but I needed to remember you. If he'd objected-- she would have taken it seriously, but maybe she should have tried harder to bring him into it, then. Things had been so strange-- there's no question she did a hundred things wrong, but maybe this time at least they can find new mistakes to make, and sort out some of the old ones.

"Does not knowing bother you? We could find out-- if you really wanted." It would make the name question easier to resolve, maybe. "I liked the idea of being surprised."