“Really?” the doubt is strong in that one word. Sure, he can but he hasn’t remembered whole swaths of things, depending on just how deep all that memory blocking HYDRA put him through really went, but… nothing at all? He’s doubtful. But he also doesn’t push it beyond that one tiny word of call-out, either. There’s a balance to these things.

“My father numbered us because he didn’t see fit to give us names. My siblings chose names for themselves, but I never bothered… need is a strong word, but I’d think it might be useful to have something to introduce yourself by, unless you just wanna be That Guy With The Metal Arm around town.” Just a thought. It’s really not so much that Five thinks he needs a name, strictly speaking, but some sort of moniker would probably be useful.