Changing your name in marriage

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I hope this doesn't make me sound incredibly nosy, but....

I always said that if I married, I would not change my last name, that I would keep my maiden name. Well, I have never married, but even now I am still inclined to say I would keep my own name. My niece is getting married next week, and is changing hers.

So I'm wondering....how many changed theirs when they married; how many didn't change theirs; etc. Anyone using a hyphenated form for a last name? Or an adopted name? Or what? I had a friend who kept her maiden name, and when they had children, the boys kept their father's surname, and the girls got the mother's surname.

I suppose there are some circumstances which can't be accounted for, but I get a bit piqued at women who insist they are never going to change, but when they get married they end up changing it anyhow.