Or MrAmr which, assuming Amr is a man, would be technically not wrong when he enters his name as “Mr Amr” and would then be (correctly) corrected by the system

Or MrAmr which, assuming Amr is a man, would be technically not wrong when he enters his name as “Mr Amr” and would then be (correctly) corrected by the system dropping the first instance of “mr” in the string.