I associate ‘youse’ with the northeast — cities, actually -— and ‘youins’ with the lower Midwest, like lower Illinois and Indiana.
‘You-all’ is south.
English at present doesn’t have a second person plural so all of these are attempts to provide one.
I still can’t figure out where the hills accent came from. I know that ethnically we are Scots-Irish but lowland Scots don’t sound anything like the Appalachian or hills speech.
On the other hand the true northeastern accent, and the Boston accent, do sound like some of the speech patterns in rural England.
People from Newfoundland sound like they just got off the boat from Ireland.
They may say it there, but my first encounter with "youins" and where I consistently hear it today is in....east Tennessee. My wife is from an upper middle class family in Knoxville and I don't hear her say it as much. But my brother-in-law in Sevier County sure does.