lastnames and ethnicity

Korean

1. Kim (Gim)
2. Lee (Yi)
3. Park (Pak, Bak)
4. Choi
5. Cho
6. Cha
7. Cheong (Chung)
8. Jeong (Jung)
9. Nam
10. Ban
11. Seo (Suh)
12. So (Soh)
13. Son (Sohn)
14. Shin
15. Noh (Roh)
16. Baek
17. Bae
18. Oh
19. Ahn
20. Yang

Examples:

Korean: Lee
Chinese: Lee, Li,

Korean: Park
Chinese: Pu, Piao,

Korean: Kim
Chinese: Jin, Kam, Kim

Korean: Moon, Mun
Chinese: Wen, Man, Boon, Bun, Mun

Korean: Chang
Chinese: Zhang, Chang, Cheung, Cheong, Teo

Korean: Yoon
Chinese: Yin, Wan, Oon, In, Een

Korean: Choi
Chinese: Cui, Tsoi, Choi, Chui

Korean: Oh
Chinese: Wu, Woo, Ng, Ngo, La

Korean: Chu, Joo
Chinese: Zhou, Chou, Chau, Chow, Chew, Choo (Jimmy Choo周仰杰)

Korean: Chae
Chinese: Cai, Chai, Choi, Tsoi, Choy…

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

postgres and java datatypes

The JDBC type BIGINT represents a 64-bit signed integer value
between -9223372036854775808 and 9223372036854775807.

The corresponding SQL type BIGINT is a nonstandard extension to SQL.

In practice the SQL BIGINT type is not yet currently implemented by any of the major databases, and we recommend that its use be avoided in code that is intended to be portable.

The recommended Java mapping for the BIGINT type is as a Java long.

ref: https://docs.oracle.com/javase/6/docs/technotes/guides/jdbc/getstart/mapping.html

BIT	boolean	Boolean
TINYINT	byte	Integer
SMALLINT	short	Integer
INTEGER	int	Integer
BIGINT	long	Long
REAL	float	Float
FLOAT	double	Double
DOUBLE PRECISION	double	Double

ref: https://www.service-architecture.com/articles/database/mapping_sql_and_java_data_types.html