Emmett will forever be the star of The Lego Movie to children of current primary school age (and their parents).
That does sound like a rather nice association, doesn't it?
Emmett is basically an Irish surname name inspired by the patriot Robert Emmett. And also the Lego Movie character. I don't think 50s America at all when I see it.
I didn't know this was also an Irish surname... I think it's dervied from Emma, right?
Anton is another Irish name - translates to Anthony. It's also Anthony in a few other languages (German, Russian, Swedish, Norwegian, Danish, Icelandic, Dutch, Bulgarian, Ukrainian, Slovene, Macedonian, Croatian, Romanian, Estonian, Finnish)... I think it's my favourite of your boy list though I like Gabriel too. I don't think it's all that popular. It was about 10 to 15 years ago around here.
I didn't know Anton was an also an Irish name. It's on the list because it's the German (etc) version of Anthony... :)