Well it is much easier then the pondering question of the chicken or the egg. Etiquette protocol indicates that the brides name proceeds the grooms on all material prior to the wedding…. Save the dates, invitations, programs, etc.
Once the couple are married and the bride takes her new husband’s name her name will follow his name.
Why do you ask? Well according to tradition the brides family pays for the wedding, therefore they are the host.