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From
[here](https://www.reddit.com/r/MamahahaTsurego/comments/vucwhu/why_do_the_stepsiblings_have_the_same_last_name/).
Mizuto Irido's dad Mineaki Irido married Yuni Ayai who is the mom of Yume
Ayai. Yuni's last name changed from Ayai to Irido. For some reason Yume Ayai
became Yume Irido too.

Is it common for children of the matriarch (well assuming heterosexual
marriages) to change their last names too?


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question
japanese-language culture japan my-stepmoms-daughter-is-my-ex
Do new Japanese step-siblings or new step-siblings in Japan often change their last name?


Generally, yes, children's last names will be changed when the parent gets
married again. Legally it doesn't seem to be obligatory (children can keep the
old surname).

Suppose a female A(Sato) married B(Tanaka) and had a child, left B with the
child, and marries C(Suzuki). The default for the child's surname would change
from Tanaka to Sato to Suzuki.

Source: [This](https://komachi.yomiuri.co.jp/topics/id/475610/) asks if anyone
gets married again with their child's name unchanged, which suggests the
opposite is considered normal to an extent. I don't see any statistics how
often people change last names because of parents' remarriage.


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answer