Family name Oriach (Oriach 
) , in the world, is a rare cognomen. The surname Oriach is characteristic of the Dominican Republic, where it is a rare surname, Spain, and Venezuela. Measured by absolute frequency, it is commonest in Spain, the Dominican Republic, and the United States. Very seldom, Oriach is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Oriach | Spain, Dominican Republic, United States, France, Venezuela |
| lluís oriach i caselles (b. 1847) |
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xavier oriach French painter, ES (b. 1927) |
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| miquel sampere i oriach Spanish engineer (1887-1940), ES (b. 1887) |
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| miquel navarro i oriach (b. 1945) |
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| frédéric oriach FR (b. 1953) |
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