I feel incredibly stupid not even trying to contact Expedia, it's like I had a brain freeze yesterday and just attempted to contact Thai by any means possible. Right now on hold with Expedia, they definitely do same day corrections without an issue, so double whammy on my stupidity. If they want silly money, I need to decide whether it's worth the risk (almost certainly not) or actually changing my name. I never use Benjamin anyway, but it's a LOT of work for such a stupid mistake. Worst nightmare is arriving, not being allowed to board and having to buy a likely full price fair so I can travel with my little boy!