Cognomen Willemetz (Willemetz 
) , all over the world, is a rare family name. The last name Willemetz is characteristic of Western Europe, particularly France, where it is a rare surname, Switzerland, and Germany, where it is an extremely rare surname.
| VARIANT | COUNTRY |
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| Willemetz | Germany, France, Brazil, United States, Switzerland |
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albert willemetz French librettist (1887–1964), FR (b. 1887) |
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| geneviève willemetz French librarian and historian (b. 1914) |
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| jacques willemetz FR (b. 1921) |
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| betty willemetz FR (b. 1936) |
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| jacqueline willemetz FR (b. 1948) |
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Mr, Camille, Coralie, Patrick, Paulina, Liliana, Jeremie, Olivier, Émeric, Sandrine, Aurélie, Caroline, Patricia, Philippe, Nathalie, Victoria, Frederic, Sebastien, Alexandra, Alexandre, Angelique, Catherine, Charles, Antoine, Xavier, Isabel, Ms, Joel, Jean, Marie, Simon, Regis, Logan, Elise, Odile, Yoann, Dominique, Marine, Maxime, Samuel, Albert, Amelie, Benoit, Pierre, Romain, Joelle, Elliot, Franck, Margot, and Guillaume