[Jackypot]

There is 'Sherman' for an American which is Sherman Tank -> Yank. So that can only be WW2 onwards. And 'Ruby' for curry (Ruby Murray) is from the fifties. Those are the most recent I can think of.

[gerdesj]

Septic is the usual one for Yank. Sherman is too polite to be true. Besides, septics have been around far longer than WWII.