Cognomen Leonhard (Leonhard 
, Леонард 
, يونارد 
, among others...) , all around the world, is quite a common family name. The cognomen Leonhard is characteristic of Germany, where it is quite a rare surname, Austria, and Malta. Measured by absolute frequency, it is commonest in Germany, the United States, and Russia. More prevalently, Leonhard is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Leonhard | Austria, Germany, France, United States, Switzerland |
| Леонгард, Леонард | Ukraine, Kazakhstan, Belarus, Russia, Kyrgyzstan |
| يونارد | Iraq, Yemen |
| לאונרד | Israel |
| Леонхард | Russia, Ukraine, Belarus, Estonia |
Lenard, Lennart, Leonard, Leonardo, Leonardus, Leonhardt, Leonhart, Linhart, Lleonard, Lénárd, Léonard, Léonhard, Von Leonhard, Леанард, Леанарда, Ленард, Ленарт, Леннарт, Лео, Леонар, Леонардо, Леонарду, Леонардус, Леонгардт, Леонхардт, Леонхарт, Лёня, לאונרדו, ليونارد, ليوناردو, レオナルド, レオナード, 莱昂纳多, and 莱昂纳德
| von völs leonhard (b. 1458) |
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| johannes christian leonhardi Swiss theologian, CH (b. 1651) |
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| johann karl leonhard (b. 1686) |
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| johann david leonhard (b. 1695) |
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| daniel josef leonhard RO (b. 1768) |
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| johann michael leonhard (1782-1863), AT (b. 1782) |
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rudolf leonhard German jurist, PL (b. 1851) |
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heinrich leonhard Dr. phil. Rheinische Friedrich-Wilhelms-Universität Bonn 1891, PL (b. 1854) |
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carl leonhard DE (b. 1848) |
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| julius emil leonhard German composer, PL (b. 1810) |
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| franz xaver leonhard German politician (1812-1882), DE (b. 1812) |
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| heinrich leonhard German architect (1813-1878), DE (b. 1813) |
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| johann hermann leonhard German physician, DE (b. 1835) |
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| franz xaver leonhard German politician (1839-1913), DE (b. 1839) |
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rudolf leonhard poet and German politician (1889-1953), DE (b. 1889) |
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Mayr, Gruber, Walter, Wagner, Wimmer, Müller, Schmidt, Schmitt, Schwarz, Baumann, Brunner, Lechner, Handlos, Hofmann, Fischer, Ziegler, Schuster, Schäfer, Hoffmann, Schweiger, Schreiner, Schneider, Geiger, Keller, Kaiser, Becker, Beck, Kuhn, Eder, Haas, Wolf, Mayer, Maier, Meier, Meyer, Seitz, Lambrecht, Sturm, Kraus, Klein, Euler, Hofer, Huber, Fuchs, Weber, Schmid, Schwab, Berger, Bauer, and Wiedemann