Should you change your last name?

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I just wanted to know if u guys think that a girl should change her last name after marriage or not? if yes...do u think boys can change their last name after marriage too or they shouldn't do it at all? I know the traditional view is that a girl should change her last name after marriage but wouldn't that change her identity...? and y should the girl be the one who always has to change her last name..but not the boy... plz post ur views...