How about having the customer actually enter the title (and name on postal and other forms) they want to be addressed as? Not everyone has a last name. Chinese

How about having the customer actually enter the title (and name on postal and other forms) they want to be addressed as? Not everyone has a last name. Chinese people have a family/village/personal name, others have just a single name. Cultural assumptions for the convenience of database schemas is unnecessary. Let people choose their username. Let them choose their "name" to be addressed as, including title.