Just Harry Potter fandom

I wonder wich of the maruders name could harry say first?

"Come on, Harry. Say it. Say padfoot."
"Moony"
"Oh for f-fudge's sake!
"Told you. I'm his favourite aren't I?
"Moony"
"Listen Harry, I'm your godfather and I'm supposed to buy you stuff. That's the deal. So the least you can do for me is say Padfoot. Your mothers smart, you should be able to pick this up fairly easily."
"Moony"
"No. Padfoot."
"P-"
"Yes, keep going!"
"P-pp."
"This is ridiculous, Harry. Padfoot"
"Moony"
"James your child is broken and needs to sort out his priorities!"