Cognomen Terrain (Teren 
, Terrain 
, Tereno 
) , in all the world, is quite a rare surname. The family name Terrain is characteristic of Slovakia, where it is quite a rare surname, Portugal, and Hungary, where it is a rare surname. In absolute terms, it is commonest in Ethiopia, France, and Slovakia. Likewise, Terrain is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Teren | India, France, Ethiopia, Slovakia, United States |
| Terrain | India, France, United States, United Kingdom, South Africa |
| Tereno | Portugal, Tanzania, Brazil, France, United States |
| Terein | United States, Spain |
Terra, Terrane, Terrein, Terreng, Terrine, Terén, Терен, ภูมิประเทศ, and วิภัติภูมิประเทศ
| christophe terrain French politician, FR (b. 1951) |
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| romain terrain rugby union player, FR (b. 1981) |
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