Family name Leonhardt (Leonhardt 
, Леонгардт 
, เลออนฮาร์ด 
) , worldwide, is a common last name. The cognomen Leonhardt is habitual in Germany, where it is quite a common surname, Switzerland, where it is quite a rare surname, and Denmark. In absolute terms, this name is the most popular in Germany, the United States, and Brazil. Very seldom, Leonhardt is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Leonhardt | Brazil, Argentina, Switzerland, United States, Germany |
| Леонгардт | Ukraine, Russia, Kyrgyzstan, Kazakhstan |
| เลออนฮาร์ด | Thailand |
| Леонхардт | Ukraine, Russia |
Lehnert, Lehnerts, Lehnertz, Leinert, Lenard, Lenart, Lenhard, Lenhardt, Lenhart, Lennartz, Leonard, Leonhard, Linert, Linhart, Linhartová, Linnert, Léonard, Léonhardt, Леанард, Ленард, Лео, Леонар, Леонард, Леонгард, Леонхард, Лёня, Лінгарт, לאונרד, ليونارد, レオナルド, レオナード, and 莱昂纳德
| leonhardt herrgott DE (b. 1505) |
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| leonhardt fronsperger German author, DE (b. 1520) |
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| leonhardt zitschger DE (b. 1550) |
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| leonhardt holzapfel AT (b. 1600) |
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| franz joseph leonhardt 1690 Heimertingen - (b. 1690) |
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| maria katharina franziska leonhardt 5 Oct 1725 Biberach - (b. 1725) |
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| leonhardt zauscher (b. 1753) |
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adolph leonhardt German judge and politician (1815-1880), DE (b. 1815) |
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| matthias leonhardt DE (b. 1773) |
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| karl gottfried leonhardt (b. 1777) |
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| johann heinrich leonhardt (b. 1782) |
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| andreas leonhardt Austrian musician, composer and conductor (1800-1866), CZ (b. 1800) |
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paul saladin leonhardt German chess player (1877-1934), DE (b. 1877) |
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carl leonhardt German musicologist, conductor and music educator, DE (b. 1886) |
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| ernst leonhardt Polish industrialist, DE (b. 1840) |
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