No.
Y'all is ALWAYS plural. Period. It is nothing more or less than the contraction of "you all". Pretty much anyone born and bred below the Dixon line will fight that one out if it takes all year.
"All y'all" is simply an intensifier, meaning "each and every one, without exception, of you".
The singular y'all is a Yankee myth, probably generated by a use of what we might call "the implied plural".
If I walk into a store and ask the first clerk, "Do y'all carry Stihl chainsaws?", yes, I am addressing one individual person, but I don't mean "do you, Tom Smith the hardware store clerk, carry Stihl chainsaws?" If it were interpreted this way, he'd say "well, sometimes I carry them from the warehouse to the shelf." Of course not, what I mean is "Does this establishment, Johnson Hardware, as a collective group of employees, of which you are the individual representative I'm addressing at the moment, carry Stihl chainsaws?"
No southerner would assume I was talking about Tom Smith the hardware clerk. That this interpretation has been twisted around to generate the Yankee myth of the singular "y'all" almost beggars the imagination.
I'm also not going to rule out the possibility that somewhere, someone heard a southerner mis-speak and MAKE A MISTAKE and unintentionally address a singular person as "y'all". But that's what we call a MISTAKE. We all make mistakes in speech from time to time.
Once again, in four part harmony, with feeling this time,
"Y'all is plural!"
There is NO CONFUSION except amongst Yankees trying to sound Southern.