No. As far as I can tell, singular "y'all", when it exists, is an implied plural. What you might hear as singular "y'all" is, say, when you go into a restaurant and say "do y'all have Coke?" to the server - that doesn't refer to just the server but to the restaurant as a whole. But I'm not a linguist and also I don't spend much time among people with heavier Southern dialect, so you shouldn't believe what I say.
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No. As far as I can tell, singular "y'all", when it exists, is an implied plural. What you might hear as singular "y'all" is, say, when you go into a restaurant and say "do y'all have Coke?" to the server - that doesn't refer to just the server but to the restaurant as a whole. But I'm not a linguist and also I don't spend much time among people with heavier Southern dialect, so you shouldn't believe what I say.