Seong-gi or Sung-ki is a Korean masculine given name.
[1] The meaning differs based on the hanja used to write each syllable of the name.
[2] It was the ninth-most-popular name for newborn boys in 1940, according to South Korean government data.
[3] The name is not commonly given to babies with the family name Nam, as the resulting name "Nam Sung-ki" (남성기) is a homograph and homophone of the Korean word for penis.
The 2005 Seoul Broadcasting System television series Hello My Teacher was criticised for its inclusion of a character with the gag name Nam Sung-ki, for this reason; some commentators believed this penis joke was inappropriate for television.