My teenaged child wants to changer her last name

Hi!!
I’m new and not sure if this is the right place to post this. Please let me know if there is a more appropriate group for this.

I’m Japanese and my spouse is a second generation Chinese American. We live in US. I have a hyphenated last name. Our kids – (dual citizen) have my spouse’s last name in US but have my Japanese last name in Japan. -I think this is very common.

One of our kid wants to change her last name(chinese) to Japanese last name legally because she feels closer to Japanese culture than Chinese culture. She wants to be seen as a Japanese person. My spouse and I are fine with the decision and would like to make it happen but the other kid does not want to. They both feel strongly about it. I am not sure what kind of problem/inconvenience we might face if we change the last name for one of them. They are both teenagers.

Thank you!!