Before the wedding, I was expecting i will use my husband family name after or it will be automatically updated in any paperwork from government, etc as normally in my country. Later found that actually all the woman married in my husband big family still carry their own name. WEIRD! For example my mother in law still use her own family name instead of my father in law family name even though they are happily being married for more than 30 years.
Without explanation from my husband, I found out that actually Belgium is on the whole an egalitarian society, so woman are not expected to change their name when they marry.
For me it is weird, but it is kinda cool also to keep your own family name. The other good thing is, the new born kids now can use the mother's family name on the Birth certificate.