Cognomen Леонхард (Leonhard 
, Linhart 
, Леонхард 
) , all around the world, is a common last name. The cognomen Леонхард is characteristic of Czechia, where it is quite a common surname, Austria, and Germany, where it is quite a rare surname. Not in comparison with a country's population, it is the most numerous in Germany, Czechia, and the United States. Likewise, Леонхард is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Leonhard | France, Switzerland, United States, Germany, Austria |
| Linhart | France, United States, Germany, Czechia, Austria |
| Леонхард | Estonia, Russia, Ukraine, Belarus |