In the US at least courts have ruled that although you have a right to travel such as by foot, your right to travel by car or plane etc is not an absolute right

In the US at least courts have ruled that although you have a right to travel such as by foot, your right to travel by car or plane etc is not an absolute right but is a privilege subject to regulation. To travel on a plane your booking name must match your government id. Old systems written in COBOL have been tried to be updated countless times over the last 70 years and it's simply not possible technologically. Therefore if this gentleman wishes to travel he will need to change his legal name. It sucks but this is the price we pay for freedom and safety.