Surname อุทร-สิวหยก (อุทร-สิวหยก 
) , in the entire world, is an extremely rare family name. Much more prevalently, อุทร-สิวหยก is the forename as well as the last name. Parts of the name also exists independently as a first name อุทร.
| VARIANT | COUNTRY |
|---|---|
| อุทร-สิวหยก | Thailand |