I suppose General Powell's name can be compared to those rare individuals named Ian who pronounce it "eye-an" (like Ian Ziering). My boss says it's a separate name according to his friend who pronounces it that way, a variation of Ivan that happens to be spelled the same, but so far I've found nothing to support this. So I wonder if it's a case of giving one's child a name without knowing the proper pronunciation, or someone just getting tired of always correcting people and conceding to the incorrect version...