Is there any particular reason why most question-starting adverbs in English start with the letter w-?

by Turius1005

e.g.

  • What
  • Who/Whom
  • Why
  • Where
Platypuskeeper

Yes. It comes from Proto-Indo European kwo- root of interrogative pronouns.

You'll see the same pattern in other Germanic languages (e.g. Norwegian hvad, hvem, hvor, hvordan) and similar things in other branches of the Indo-European family (e.g. Latin quod, quis, quid, quo)