Are we just talking about men? Most women are basically expected to change their last name upon marriage in many countries. To me it's just a name. My wife kep

Are we just talking about men? Most women are basically expected to change their last name upon marriage in many countries. To me it's just a name. My wife kept her last name and and it seems the past generations simply can't accept that. My extended family still mails her letters using my last name.