I like the name Henry. And your step daughter can name her baby whatever she wants. It's not your decision.
Thankfully for you, it's just a middle name. But to answer your request of middle name suggestions, here is a variety of names since I have no idea what your name style is... Noah Cameron Noah Elliot Noah Leondardo Noah Hayden Noah Avery Noah Corbin Noah Reese/Rhys Noah Tobias Noah Benjamin Noah Malcolm Noah Donovan Noah Ashton Noah Finn or Finlay Noah Forest Noah Jasper Noah Lucas Noah Weston Noah Keegan.
Welll MAYBE someday step mother this is one of those times where you shut your dang mouth, smile nicely and let them name the child whatever they want. It's a middle name FOR THE LOVE OF GOD. A middle name serves no legit purpose and it's typically only used on legal documents so IF (and that's a big IF) you stay around long enough to actually become a step mother (lord help your step daughter) you will rarely if ever have to hear the name Henry.
As a few people stated Henry is hardly and outdated or "old" name. In fact "old" names are in vogue now so it's unlikely he'll be the only child in his class with Henry in his name. This is not YOUR time it's your maybe someday step daughter's time, it's your maybe someday son-in-laws time and it's your maybe someday step grandsons time.
BACK OFF! As for middle name choices, there are a variety that go with Noah. Noah Cameron Noah Gabriel Noah Alexander Noah Caleb Noah Michael Noah Tyler.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.