Cognomen Undas (Undas 
) , throughout the world, is a rare last name. The last name Undas is habitual in Poland, where it is a rare surname, Czechia, and Philippines, where it is a very rare surname. In absolute terms, this name is the most popular in India, Indonesia, and Philippines. Likewise, Undas is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Undas | Indonesia, Philippines, Mexico, India, Poland |
| stanisław undas Polish officer, PL (b. 1894) |
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| anetta undas Polish physician and researcher, PL (b. 1965) |
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| anna undas researcher |
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