Why do surnames matter so much?

My mother's maiden name.

My surname.

My first husband's surname.

My ex-husband's surname.

I broke up with him but I want our son to use his.

My new Farang husband's surname

I want my daughter to use my Farang husband's surname.

I'm married but I still want to use my mother's maiden name...

because when she dies, I could get her fortune.

Oh human ... we evolve just around this stupid something that is actually nothing.

Names and surnames are supposed to be something that remind us the reason of our existence every time we are called, aren't they? especially Thai names that most of the names have nice meanings... to be good, to be fair, to be happy, to be joyful, to be conscious, to be diligent, etc...