English edit

Etymology edit

Borrowed from Japanese 平井 (Hirai).

Proper noun edit

Hirai (plural Hirais)

  1. A surname.

Statistics edit

  • According to the 2010 United States Census, Hirai is the 31001st most common surname in the United States, belonging to 749 individuals. Hirai is most common among Asian/Pacific Islander (80.64%) individuals.