Q: What words have folk etymologies (e,g., "an apple" from "a napple")?

A: This phenomenon is also called "metanalysis" or "affix-clipping."

adder (a nadder -> an adder) aitch-bone (a nache-bone -> an aitch-bone) apple (a napple -> an apple) apron (a naprun -> an apron) auger (a nauger -> an auger) eyas (a neyas -> an eyas) newt (an ewt -> a newt) nickname (an eke-name -> a nickname)

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