Family name Louderback (Louderback 
) , in all the world, is quite a rare surname. The last name Louderback is habitual in the United States, where it is a rare surname, Canada, where it is a very rare surname, and New Zealand. Measured by absolute frequency, it is commonest in the United States, Canada, and Germany.
| VARIANT | COUNTRY |
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| Louderback | Brazil, Canada, United States, Germany, New Zealand |
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david s. louderback American politician (1851-1911), US (b. 1851) |
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george louderback American geologist (1874-1957) (b. 1874) |
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| harold louderback United States District Judge, US (b. 1881) |
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| walt s. louderback American artist (1887-1941), US (b. 1887) |
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jim louderback American businessman, US (b. 1961) |
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| tom louderback American football player, US (b. 1933) |
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| dick louderback member of the National Cartoonists Society |
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