Where did the INN name of fentanyl come from? Fentanyl is a potent anilidopiperidine opioid. Where did its INN name come from? 



Figure 1: Fentanyl

I know that the INN name of paracetamol came from its chemical name para-acetylaminophenol (par-acet-am-ol). Is there a meaningful origin of the INN name of fentanyl?
My guess: the name may be based on two of the immediate precursors to the drug, N-Phenethyl-4-piperidone (FENT, from Phen + ethyl?) and aniline (ANYL):



Definitely not as straight-forward as your para-acetylaminophenol example.