Last name Siahu (Siahu 
) , in the entire world, is a very rare cognomen. The surname Siahu is habitual in Australia, where it is a very rare surname, Indonesia, and Mexico, where it is an extremely rare surname. Much less frequently, Siahu is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Siahu | Indonesia, Mexico, Australia, India, United States |