It's a strong and wonderful name. It reminds me Iago from "Othello". The form that I prefer is Jago (Jaygo). All of them are cognates of my wonderful name: Jacob.
I love this name, but I concede that it would be much too hard to get around the popular associations people have with this name. I'd never give it to a kid.
I love this name, but the Othello association is quite strong. As Iago is a villainous character, the name bears bad connotations. Still, I think it can work well as a middle name.