Nguyễn is the most common Vietnamese family name.
Kevon kevono / Wikipedia, Tiny Fox Lab

Roughly 30-40% of Vietnamese people have the surname Nguyen. For comparison, the most popular surname in America is Smith, shared by 0.8% of the population. – Tiny Fox Lab Facts

Preview photo credit: Kevon kevono / Wikipedia
Source: atlasobscura.com/articl…