Perhaps “die out” isn’t the best word choice, but it’s what I’ll stick with. No one considers themselves Frankish today, with their descendants being a mix of French, German, and everything in between, so when did the last Franks cease to be? Did they speak Frankish, or did Frankish die out long before people stopped identifying as Franks? Did they have any political power or prestige, or were they pushed to the outskirts of society?