Family name Viader (Viader 
) , in the entire world, is a rare cognomen. The cognomen Viader is characteristic of Puerto Rico, where it is quite a rare surname, Spain, where it is a rare surname, and Argentina. In absolute terms, it is the most numerous in Spain, France, and Argentina. Likewise, Viader is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Viader | Spain, United States, Puerto Rico, Argentina, France |
| francesc grau i viader Spanish journalist and writer (1920-1997), ES (b. 1920) |
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| antonio viader (b. 1935) |
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| sebastià riera i viader (b. 1950) |
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| joan maria viader (b. 1953) |
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| raimon parés viader researcher ORCID ID = 0000-0001-9095-5748 |
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| véronique viader researcher (ORCID 0000-0003-0704-6565) |
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| jeroni viader |
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| baldiri viader |
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| roland viader FR |
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| damià viader Spanish footballer, ES (b. 1998) |
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