Surname Naohiko (Naohiko 
) , across the world, is a rare last name. The family name Naohiko is habitual in Singapore, where it is a rare surname, Japan, where it is a very rare surname, and Cambodia. In absolute terms, it is the most numerous in China, Japan, and Singapore. Likewise, Naohiko is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Naohiko | Singapore, Brazil, United States, Japan, China |