Last name Plain (Pelan 
, Plen 
, Plain ) , throughout the world, is quite a common family name. The cognomen Plain is characteristic of Slovenia, where it is quite a rare surname, Czechia, and Thailand. In absolute terms, it is commonest in Thailand, the United States, and France. Very seldom, Plain is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Pelan | France, Czechia, United States, India, United Kingdom |
| Plain, Plen | Australia, France, United Kingdom, India, United States |
| ธรรมดา | Thailand |
| gebhard i. von plain Roman Catholic bishop, IT (b. 1170) |
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william plain Australian politician, AU (b. 1868) |
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honest john plain British guitarist, GB (b. 1952) |
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| belva plain American writer (1915-2010), US (b. 1915) |
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rozi plain British musician, GB |
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| bernie plain British long-distance runner, GB (b. 1946) |
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| andrew plain Australian sound editor (1953-2013), AU (b. 1953) |
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| susan de la plain (b. 1952) |
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| bradley plain Australian rules footballer (b. 1969) |
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| natalie plain American businesswoman (b. 1973) |
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| jérôme plain researcher |
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| noah plain college basketball player (2019–2019) Alcorn State |
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| karren m plain researcher |
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| t. l. plain College basketball coach, US |
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| caroline plain researcher |
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