When I was growing up in Milwaukee, many working-class people said 'aina?', short for 'ain't it?.' These did not seem to be American country people (users of ain't), and I thought that 'aina' was a replacement for the German 'nicht wahr?" Thus it would resemble England's 'innit?'.

I haven't lived there for a long time, so I don't know if it has died out.