<p>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).</p>
<p>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.</p>
<p>Source: <a href="https://komachi.yomiuri.co.jp/topics/id/475610/" rel="nofollow noreferrer">This</a> 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.</p>

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2022-07-20T22:15:46.160Z
2022-07-24T03:45:44.040Z
2022-07-24T03:45:44.040Z
sundowner
<p>From <a href="https://www.reddit.com/r/MamahahaTsurego/comments/vucwhu/why_do_the_stepsiblings_have_the_same_last_name/" rel="nofollow noreferrer">here</a>. 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.</p>
<p>Is it common for children of the matriarch (well assuming heterosexual marriages) to change their last names too?</p>

<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?
# Do new Japanese step-siblings or new step-siblings in Japan often change their last name?
Posted by: username_0 on 2022-07-20
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?
**Tags:** japanese-language culture japan my-stepmoms-daughter-is-my-ex
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## 1 answers
### Answer by username_1 on 2022-07-20. Score: 2 | Accepted answer
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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