This page in Dutch.
This info for other countries
Marriage has no influence on the name of a person .
When a child is born and the mother is married, the child will get the family name of the husband .
The name of a person can be found on his identity card.
When Belgian nationals want to travel outside the European Union, they can obtain a passport, which will be valid for a limited number of years (1 or 2 years or more)