Last name Willi (Willi 
, 威利 
, Вилли 
, among others...) , in all the world, is a common cognomen. The family name Willi is habitual in Liechtenstein, where it is a common surname, Switzerland, where it is quite a common surname, and Iran, where it is quite a rare surname. Measured by absolute frequency, the name is most common in Iran, Switzerland, and the United States. More frequently, Willi is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Willi | Brazil, Switzerland, Nigeria, Indonesia, Germany |
| 威利 | China |
| Вилли | Kazakhstan, Russia, Kyrgyzstan, Armenia, Ukraine |
| فيلي | Iraq, Egypt, Palestinian Territory, Iran, Algeria |
| וילי | Israel |
| daniel willi Swiss theologian (1696-1755), CH (b. 1696) |
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| andrea willi Italian priest, writer and mathematician (1733-1793), IT (b. 1733) |
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| ulrich willi CH (b. 1756) |
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| hans jakob willi (1772-1804), CH (b. 1772) |
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dominikus willi German priest and theologian, CH (b. 1844) |
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| philipp willi (1828-1892), CH (b. 1828) |
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| eduard willi (b. 1846) |
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| johannes willi Swiss textile entrepreneur and politician (1882–1952), CH (b. 1882) |
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| georg willi CH (b. 1884) |
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| heinrich willi Swiss pediatrician (1900-1971), CH (b. 1900) |
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herbert willi Austrian composer, AT (b. 1956) |
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| ernst willi CH (b. 1900) |
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| gion willi (1915-1982), CH (b. 1915) |
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monika willi Austrian film editor, AT (b. 1968) |
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| ruth willi 1919 - 2004 (b. 1919) |
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Koch, Peters, Jansen, Walter, Wagner, Werner, Müller, Möller, Schmidt, Schmitt, Schmitz, Schwarz, Krüger, Richter, Neumann, Hofmann, Fischer, Schäfer, Hartmann, Hoffmann, Schröder, Schneider, Krause, Schumacher, Keller, Becker, Lang, Jung, Wolf, Mayer, Maier, Meier, Meyer, Silva, Bauer, Braun, Klein, Peter, Lange, Emeta, Huber, Fuchs, Weber, Wonka, Santos, Sunday, Schulz, Kaiser, and Zimmermann