User blog comment:Gourgeist/User Miskos3/@comment-24121336-20131109071548/@comment-179280-20131109074046

Afaik, Yeager (english) is derived from Jäger (german), and is also an actual surname, so my guess is that he chose it to facilitate pronounciation for english readers. After all, イェーガー is phonetic writing for both.