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I had never heard the name "Acetainophen", apparently it's the same as Paracetamol.

From wiki:

"Both acetaminophen and paracetamol come from a chemical name for the compound: para-acetylaminophenol and para-acetylaminophenol."

The former is the name used by the United States Adopted Name (USAN) while the latter is the (International Nonproprietary Name (INN) one.

Ah, that explains why I've only heard the name acetaminophen (I'm an American)

Same for Tylenol (most common branded version of the drug, at least in the US): para-acetylaminophenol

Paracetamol is the far more common name. In the US and a handful of other countries they call it "acetaminophen", though.