Cognomen Karthick (Karthick 
) , globally, is quite a rare last name. The surname Karthick is characteristic of Western Asia, particularly United Arab Emirates, where it is quite a rare surname, Qatar, and Oman. Not in comparison with a country's population, it is commonest in India, United Arab Emirates, and Saudi Arabia. More prevalently, Karthick is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Karthick | United Arab Emirates, India, United States, Sri Lanka, Saudi Arabia |
| muthupandi karthick researcher |
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| kannimuthu karthick researcher (ORCID 0000-0003-2689-0657) |
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| chennakesavan karthick researcher (ORCID 0000-0003-3538-2646) |
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| t. karthick Ph.D. 2010 |
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| sanjeev karthick Indian Tamil films actor (b. 1988) |
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| shree karthick Indian film director (b. 1988) |
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| vignesh karthick actor, IN (b. 1988) |
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