Even worse in other languages. The three surnames Kim, Lee, and Park cover about 50% of Koreans.
And don't forget that there's Lee[1], Lee[2], Lee[3], Lee[4], and Lee[5]! Which are all different
[0] https://en.wikipedia.org/wiki/Vietnamese_name
[1] https://en.wikipedia.org/wiki/Lee_(English_surname)
[2] https://en.wikipedia.org/wiki/L%C3%BD_(Vietnamese_surname)
[3] https://en.wikipedia.org/wiki/Lee_(Korean_surname)