If you start looking into the history of the rogue class, you end up reaching several dead ends. The reason is that a rogue who's easy to track or trace isn't much of a rogue at all. We specialize in disappearing, which makes rogue family trees notoriously difficult to map. Garona Halforcen is often considered to be the mother of the rogue class, executing one of the earliest and most daring acts of assassination and regicide in Azeroth's history.
The truth is that if we want to find our spiritual beginnings, we have to look back even further than Garona and even further away than Azeroth. The true ancestor of today's rogue class first found life eons ago, in another realm, known only as Sanctuary. There, the assassin class stood against the three Prime Evils, defeating the Burning Hell's greatest powers with elegance and subterfuge. The rogues of WoW were inspired by the assassins of Diablo II, and that influence can still be felt today.