List of clans: http://koreangenealogy.org/book/online-addendum/surnames-clans/

Stats about gender division: http://www.erumy.com/nameAnalyze/AnalyzeMyName.aspx?name=[Fill in name]

Hanja information: https://koreanhanja.app/ https://hanja.dict.naver.com/#/main

Surname List: https://en.wikipedia.org/wiki/List_of_Korean_surnames

List of Given Names

https://en.wikipedia.org/wiki/List_of_Korean_given_names

https://namu.wiki/w/

https://sgis.kostat.go.kr/statbd/family_02.vw
Population Distribution for surnames (you need to be able to read or at least match hangeul.)

http://dh.aks.ac.kr/hanyang/wiki/index.php/%EC%A1%B0%EC%84%A0%EC%8B%9C%EB%8C%80_%EA%B4%80%EC%A7%81_%EB%AA%A9%EB%A1%9D_(%EA%B2%BD%EA%B4%80%EC%A7%81)
List of Joseon titles.

http://dongryeo.org/dr/bbs/board.php?bo_table=sce3_01&wr_id=17


List of Goryeo titles

https://kosis.kr/statHtml/statHtml.do?orgId=101&tblId=DT_1INOOSB&conn_path=I2
Households in 2000

https://kosis.kr/statHtml/statHtml.do?orgId=101&tblId=DT_1INOOSC
Division by male/female for each family in 2000