[Solved] Although I’m not an insect, some people found me very difficult to exterminate. They called me something like ‘insane priest.’ The first half of my name means the same as ‘scrape,’ & my last three letters are a metal. Who am I?

This riddle has been around for some time on internet platforms such as Instagram, Facebook, and WhatsApp, and many people still argue over what the answer might be, as there are many possibilities. The correct answer is rasputin