Family name Neidhardt (Neidhardt 
) , across the world, is quite a rare last name. The last name Neidhardt is habitual in Western Europe, particularly Germany, where it is quite a rare surname, Austria, and Switzerland, where it is a rare surname. Measured by absolute frequency, this name is the most popular in Germany, the United States, and Austria. Very seldom, Neidhardt is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Neidhardt | Switzerland, United States, Germany, France, Austria |
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neidhardt von thüngen German bishop, DE (b. 1545) |
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| wolfgang neidhardt DE (b. 1542) |
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johann eberhard neidhardt Grand Inquisotor of Spain, AT (b. 1607) |
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| erhard neidhardt (b. 1595) |
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| johann georg neidhardt German organist, composer and music theorist, DE (b. 1680) |
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| johann andreas neidhardt (b. 1772) |
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| eduard neidhardt DE (b. 1801) |
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dmitry neidhardt FR (b. 1861) |
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| alexander neidhardt (b. 1819) |
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| boris neidhardt (b. 1819) |
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| karl von neidhardt German jurist, DE (b. 1831) |
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| felix neidhardt Austrian teacher and writer, AT (b. 1859) |
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| alois neidhardt (b. 1856) |
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peter neidhardt PL (b. 1911) |
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| paul neidhardt German painter, DE (b. 1873) |
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