Harman, I think, is Germanic or Old English and means Grey Man. I think my dad’s father is from somewhere around Germany but I can’t remember for sure and it’s too late in the evening to call him, really.
As for Blank, a few years ago, there was this one day where I was half considering coming up with a pen name for some reason or another, and I was at an art show and I met this girl, I think she was some sort of Scandinavian, she told me her last name was Blank, and I took that as a sign I should change my name to that. So I kinda did. I have no idea where it came from.