Last name Smarth (Smarth 
) , worldwide, is a rare family name. The last name Smarth is habitual in Nigeria, where it is a rare surname, Nicaragua, where it is a very rare surname, and Chile. Measured by absolute frequency, it is the most numerous in Nigeria, India, and the United States. Also, Smarth is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Smarth | Democratic Republic of the Congo, India, Chile, United States, Nigeria |
| rosny smarth Haitian politician, HT (b. 1940) |
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| pascal smarth Haitian artist, HT |
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| carole smarth researcher |
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