I relate. I have some cracking title ideas for stories I ain't written.
Litopia
Katie-Ellen
Barbara
Mildly annoying when that happens, in't it @Katie-Ellen Hazeldine. The idea for the title came from a WW2 documentary and it would be the obvious story choice but I feel WW2 has been done enough.
Leonora
Over half of historical novels I saw listed in the HNS society this year are set in WW2! Apparently the US is mad for it too. Go for it!
AgentPete
Hold on to it. Great titles are rare as hen's teeth.