Things WE feel sure of for ALL Y’ALL … and why.
Y'all is a contraction of you-all and is the main 2nd person plural pronoun in Southern American English. The earliest attestations of y'all are found in the Southern Literary Messenger (Richmond, VA) in 1856 and 1858.
Things WE desire for YOU’UNS … and why.
Yinz is a derivation from the original Scots-Irish "Yin(s)” - meaning you ones, yous ones and ye 'uns, a form of the 2nd person plural that is commonly heard in Scotland, Ulster and parts of Ireland and Northern England.