<p>Per <a href="https://swordartonline.fandom.com/wiki/Kirigaya_Kazuto" rel="noreferrer">the fan wiki</a>, his surname was Narusaka (鳴坂) prior to his adoption.</p>

<blockquote>
  <p>Born on October 7, 2008, Narusaka Kazuto was adopted by his aunt and uncle a year after his birth, when his biological parents died in an accident.</p>
</blockquote>

<p>According to <a href="https://www.monstersandcritics.com/anime/sword-art-online-season-4-release-date-sao-unital-ring-light-novels-the-sequel-to-the-four-cour-alicization-anime-spoilers/" rel="noreferrer">this news article</a> and some other sources I found, this was revealed at the beginning of <em>Unital Ring</em>, originally in <a href="https://twitter.com/sao_wikia/status/939465711772209152" rel="noreferrer">the January 2018 issue</a> of Dengeki Bunko, which publishes SAO as a serialized story.</p>

CC BY-SA 4.0
2019-06-08T00:14:48.617Z
2019-06-08T00:14:48.617Z
Maroon
<p>Most of you will say Kirigaya, but that is his adopted family name.  Kazuto's mother was Midori's sister and was married to a man from a different family.</p>

<sword-art-online>
What was Kirito's actual family name?
# What was Kirito's actual family name?
Posted by: username_0 on 2019-06-07
Most of you will say Kirigaya, but that is his adopted family name. Kazuto's mother was Midori's sister and was married to a man from a different family.
**Tags:** sword-art-online
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## 1 answers
### Answer by username_1 on 2019-06-08. Score: 7 | Accepted answer
Per [the fan wiki](https://swordartonline.fandom.com/wiki/Kirigaya_Kazuto), his surname was Narusaka (鳴坂) prior to his adoption.

> Born on October 7, 2008, Narusaka Kazuto was adopted by his aunt and uncle a year after his birth, when his biological parents died in an accident.

According to [this news article](https://www.monstersandcritics.com/anime/sword-art-online-season-4-release-date-sao-unital-ring-light-novels-the-sequel-to-the-four-cour-alicization-anime-spoilers/) and some other sources I found, this was revealed at the beginning of *Unital Ring*, originally in [the January 2018 issue](https://twitter.com/sao_wikia/status/939465711772209152) of Dengeki Bunko, which publishes SAO as a serialized story.
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