Charlie Weaslie doesn't have a middle name.
Actually he most likely does because a lot of his family does including some of his siblings but if he does have one it's unknown.
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Charlie Puth's middle name is Otto
Charlie Swan, middle name isn't mentioned.
Renesmee was named after Edward's mom, Esme, and Bella's mother, Renee. They combined their names and the outcome of that was Renesmee.
Charlie m Stewart's birth name is Charles Marcus Stewart.
Charlie Talbert's birth name is Charles McClellan Talbert.