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W3C Internationalization:

People who create web forms, databases, or ontologies are often unaware how different people’s names can be in other countries. They build their forms or databases in a way that assumes too much on the part of foreign users. This article will first introduce you to some of the different styles used for personal names, and then some of the possible implications for handling those on the Web.

Bottom line: Am Besten ein einziges Textfeld für den vollen Namen verwenden, wenn für globales Publikum entwickelt wird.