Last year I travelled with a friend, who'd booked his ticket from OSL-DOH-DPS as Frank, rather than Francis (as per his passport) by accident. At check in, he was not allowed to check in, and had to go the Qatar service desk in Oslo airport, where the agent had to call Qatar to arrange a name change, which only cost around 15GBP, but took a long time to do (90 minutes mostly waiting in the queue). so I would arrive in plenty of time for check in, just in case.