Announcement of the Sōshi-kaimei policy issued by the Taikyu court, written bilingually in Japanese and Korean, in a special parallel style in which hanja/kanji were printed only once and were "shared" by the hangul and kana texts
Literal meaning: "Create a surname (shi) and change (your) given name).
Sōshi-kaimei (創氏改名) was a policy (created by General Jiro Minami, Governor-General of Korea) implemented onto indigenous Koreans upon the occupation of Korea under Japanese rule. Defined by Ordinance No. 19 issued in 1939, sōsh - literally means: "creation of a family name" (氏 shi ), which was mandatory at the time because Koreans did not use Korean family names, instead they used Bon-gwan (姓 sei ). While, Ordinance No. 20 issued in 1940, kaime - literally means: "changing [your] given name", was voluntary and the patron would be charged a fee. This was effectively a reversal of an earlier government order which forbid Koreans from taking up Japanese names before then. There are various explanations for the purpose of the ordinances.
Order No. 124 
In 1909, the Korean Empire established a civil registration law (民籍法 minsekihō ), starting the creation of a modern family registry system. With regards to the recording of details about women such as the father's surname, age, and connection to the registry holder, due to attention that needed to be given to avoiding conflict with Korean customs, the drafting of the law was not completed until April 1910, just before the annexation of Korea. By that time, a portion of Koreans had already registered Japanese-style names and the like, which generated confusion. As a result, on the basis of memoranda such as Order No. 124, "Document regarding name changes by Koreans" issued by the Governor-General of Korea on November 11, 1911, the use by Koreans of "names which might be mistaken for those of native Japanese" was no longer permitted, and strict controls were placed on the registration of Japanese-style names for newborn children. Additionally, Koreans who had registered Japanese-style names on there were required to revert to their original names.
Ordinances No. 19 and 20 
In 1939 and 1940, a new name-change policy came into effect by means of Ordinances No. 19 and 20. Originally, as in Taiwan, the new name-change policy was intended simply to allow change of surname (sei/seong) and given name, but because Korea had a long-established custom (recently abandoned) whereby people of the same bon-gwan (surname and clan) were not allowed to marry each other, in order that this custom could continue, it was decided that the policy would be implemented by leaving the clan name and sei the same in the family register, while permitting a new family name (shi/ssi) to be registered. On the other hand, in Taiwan, which was also under Japanese rule in the same period, but did not have an analogous custom, the policy was not described as "creation of a shi", but was simply "change of sei and given name" (改姓名).
With regards to the creation of a family name (shi), there were both "shi created by (individual) selection" (設定創氏) and "shi created by law" (法定創氏). In the half year between February 11 and August 10, 1940, those who provided notification could create a shi of their own choosing, while those who did not provide any notification would have their shi defined by the clan name (sei) of the head of the household. After the "creation of a family name", a Korean had three names which are a family name shi, a clan name sei, and a personal name mei (first name), all of which are recorded in a person's family register along with the origin place of the clan, bon-gwan. Since all members of a family share the same family name shi, wife's shi, and hence the first character in her legal name, would be the same as her husband's, which differed from the traditional Korean clan name sei, whereby a wife kept her original sei even after marriage (see table). Besides that, selection of a shi with a Japanese-style reading could also be approved; to go along with such a shi, it was also permissible to change one's given name to a Japanese-style name; as the change of given name was voluntary, a fee would be charged for it. Additionally, at the same time, the mukoyōshi system, i.e. an adoption of a daughter's husband (婿養子制度), which up until then had been forbidden under Korean law, was also introduced. This case was also included in the sōshi-kaimei policy.
Declaration of individually selected shi and changes of given name initially (in February 1940) were conducted on the basis of voluntary notification. However, at the April prefectural governors' meeting, because of instructions such as "Special consideration should be taken so that the shi registration of all households can be completed by the coming July 20" the administration began to seriously promote the policy, and as a result, starting from April, the number of households registering individually selected shi began to rise sharply. As of April, only 3.9% of all households had provided notification for creation of a shi, but by August 10, that figure had risen to 80.3%. Also, statements opposing the policy of sōshi-kaimei were censored according to the internal security laws.
There are several viewpoints regarding this sudden increase. Most argue that official compulsion and harassment existed against individuals who would not create a new Japanese-style shi, but disagree whether this was the result of individual unauthorised practises by low-level officials , the policy of some regional government organisations, or an overall intention of the colonial government. Others argue that Koreans seeking to avoid discrimination by Japanese voluntarily created Japanese-style family names.
Regardless, of Koreans living in Korea, the proportion of those who changed their given name reached only 9.6%. Among Koreans living in the mainland of Japan, the proportion of those who created a new shi by individual selection reached 14.2％.
Restoration of original names 
|Name Restoration Order|
|Hangul||조선 성명 복구령|
|Revised Romanization||Joseon Seongmyeong Bokguryeong|
|McCune–Reischauer||Chosŏn Sŏngmyŏng Pokkuryŏng|
After the liberation of Korea from Japanese rule, the Name Restoration Order was issued on October 23, 1946 by the United States military administration south of the 38th parallel, enabling Koreans to restore their Korean names if they wished to. However, not all Koreans returned to using their original names, especially Koreans living outside of Korea. Many Zainichi Koreans chose to retain their Japanese names, either to avoid discrimination, or later, to meet the requirements for naturalization as Japanese citizens, while some Sakhalin Koreans who had taken Japanese names were registered by Soviet authorities under those names (which appeared on their Japanese identity papers) after the Red Army occupied Karafuto, and up to the present day[update] have been unable to revert their legal names to their original Korean ones.
Name registration of prominent individuals 
Those who took a Japanese-style name 
- Kim Suk-won (金錫源), a.k.a. Kaneyama Shakugen (金山錫源), Major General in the Imperial Japanese Army
- Park Chung-hee (朴正熙), a.k.a. Takagi Masao (高木正雄), Lieutenant in the army of Manchukuo, later president of South Korea
- Lee Myung-bak (李明博), a.k.a. Tsukiyama Akihiro (月山明博), incumbent president of South Korea 
- Kim Dae-jung (金大中), a.k.a. Toyota Daiju (豊田大中), former president of South Korea
Those who retained their Korean-style name 
- Hong Sa-ik (洪思翊), Lieutenant General in the Imperial Japanese Army
- Pak Chun-geum (朴春琴), member of the House of Representatives (see Japanese Wikipedia article)
- Han Sang-ryong (韓相龍), member of the House of Peers (see Korean Wikipedia article)
- Yi Gi-yong (李埼鎔), member of the House of Peers
Timeline of family registration procedures in Korea 
|Year||Individual||Clan name; bon-gwan (本貫) and seong (姓)||Family name; ssi (氏)||First name; mei (名)||Full name/record|
|Prior to 1909: Recording in family register (族譜) (The family register was typically managed by the head of the clan; however, some citizens did not have a seong)||Husband||Gimhae Kim (金海金)||None||Mu-hyeon (武鉉)||Kim Mu-hyeon (金武鉉)|
|Wife||Gyeongju Yi (慶州李)||None||None||No record, as the woman's name was not recorded in the register (族譜)|
|1910 to 1940: Minseki law system (民籍法制定)||Husband||Gimhae Kim (金海金)||None||Mu-hyeon (武鉉)||seong and given name Kim Mu-hyeon (金武鉉)|
|Wife||Gyeongju Yi (慶州李)||None||Mu-a (撫兒)||seong and given name Yi Mu-a (李撫兒)|
|1940 to 1945: sōshi-kaimei (the legal name, which used to be seong and given name, because ssi and given name)||In the case of a ssi created by law|
|Husband||Gimhae Kim (金海金)||Gim||Mu-hyeon (武鉉)||ssi and given name Kim Mu-hyeon (金武鉉)|
|Wife||Gyeongju Yi (慶州李)||Gim||Mu-a (撫兒)||ssi and given name Kim Mu-a (金撫兒)|
|In the case of a ssi created by the individual|
|Husband||Gimhae Kim (金海金)||Yamato (大和)||Takehiro (武鉉)||ssi and given name Yamato Takehiro (大和武鉉)|
|Wife||Gyeongju Yi (慶州李)||Yamato (大和)||Nadeshiko (撫子)||ssi and given name Yamato Nadeshiko (大和撫子)|
|After 1946 Name Restoration Order||Husband||Gimhae Kim (金海金)||None||Mu-hyeon (武鉉)||seong and given name Kim Mu-hyeon (金武鉉)|
|Wife||Gyeongju Yi (慶州李)||None||Mu-a (撫兒)||seong and given name Yi Mu-a (李武鉉)|
- The application period for creation of a ssi was limited to six months in length, while there was no time limit placed on the change of given name
- Children inherited their father's bon-gwan and seong
- Children of an unmarried woman inherited the woman's bon-gwan and seong
- Even if one married, the recorded native region and clan name could not be changed
- According to customary Korean law (now no longer followed), one can not marry with a person of the same clan name and the same clan origin related within 6 or 8 degrees
See also 
- In Korean, the family name is called either seong (성, 姓), ssi (씨, 氏) or seongssi (성씨, 姓氏).
- Original quote: 「内地人ニ紛ハシキ姓名」
- Mizuno, Naoki. 植民地支配と「人の支配」 (Colonial control and "human control"). Kyoto University. Retrieved 2006-11-26.
- Cho, Eui-seong. 朝鮮人の姓名 (Names of Koreans). Tokyo University of Foreign Studies. Retrieved 2006-11-26.
- Original quote: 「きたる7月20日迄に全戸数の氏届出を完了する様特段の配慮相成りたし」
- Fukuoka, Yasunori (1996). Beyond Assimilation and Dissimilation: Diverse Resolutions to Identity Crises among Younger Generation Koreans in Japan. Saitama University. Retrieved 2006-11-27.
- Baek, Il-hyun (2005-09-14). "Scattered Koreans turn homeward". Joongang Daily. Retrieved 2006-11-27.[dead link]
- General Kim Suk Won. Korea Web Weekly. 2002. Retrieved 2006-11-26.
- * (Japanese) Nagasawa, Masaharu (2001-11-23). 半島に渡った日本語・日本語文学. Saga Women's Junior College. Retrieved 2006-11-25.
- "이명박 선친의 성은 '쓰키야마(月山)'였다 (in Korean)". Hankook Ilbo. Retrieved 2007-01-19. Retrieved 2012-03-08.
- Chun, Young-gi (2004-03-05). "War criminal, general, but still Korean". Joongang Daily. Retrieved 2006-11-24.[dead link]
- (Japanese) Mizuno, Naoki (February 2004). "『創氏改名』の実施過程について (About the implementation process of Sōshi-kaimei)". 朝鮮史研究会会報 (Proceedings of the Association for the Study of Korean History) (in Japanese) (Tokyo, Japan: National Informatics Institute) 154. Retrieved 2006-11-25.
- (Japanese) Nagasawa, Masaharu (2001-11-23). 半島に渡った日本語・日本語文学. Saga Women's Junior College. Retrieved 2006-11-25.
- "Korea under Japanese rule". Library of Congress country studies (Washington, D.C.: United States Library of Congress). 1982. Retrieved 2006-11-25.
- William, Wetherall; Changsoo Lee and George De Vos (eds.) (1981). "Public Figures in Popular Culture: Identity Problems of Minority Heroes". Koreans in Japan: Ethnic Conflict and Accommodation. Berkeley: University of California Press. pp. Chapter 12, pp. 281–303 (text), 406–413 (notes). Footnote 16 gives bibliographic references for Korean perspectives on the Soshi-Kaimei policy.