Family name Gastmans (Gastmans 
) , all around the world, is a rare last name. The cognomen Gastmans is characteristic of Belgium, where it is quite a rare surname, France, where it is a very rare surname, and Brazil, where it is an extremely rare surname. Very seldom, Gastmans is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Gastmans | Germany, Brazil, Spain, Belgium, France |
| walter f. gastmans botanist (b. 1935) |
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| amanda gastmans (b. 1934) |
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| edgard gastmans BE (b. 1938) |
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| raymond gastmans (b. 1938) |
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| jozef gastmans BE (b. 1943) |
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| raymond gastmans Dr.Sc. Katholieke Universiteit Leuven 1968 |
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| didier gastmans researcher (ORCID 0000-0002-1340-3373) |
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| andré gastmans |
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| tom gastmans BE |
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| chris gastmans Belgian university teacher, BE |
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Mr, Benott, Denise, Didier, Gerald, Leslie, Tamara, Hannah, Walter, Michael, Alderik, Anthony, Coralie, Céline, Bernard, Raymond, Gaëlle, Laurens, Joachim, Mireille, Geoffrey, Elgertsje, Alvaro, Inés, Jonas, Jamie, Ms, Kim, Tim, Bart, Bert, Dirk, Jana, Jean, Elly, Inge, Christian, Steve, Chris, Bernd, Karel, Katja, Kenny, Kelly, Kevin, Peter, Laura, Loira, Stijn, and Christina