Family name Tonkikh (Тонких 
, Tonkikh 
) , all around the world, is quite a common cognomen. The cognomen Tonkikh is characteristic of Russia, where it is quite a rare surname, Kazakhstan, and Kyrgyzstan. Measured by absolute frequency, this name is the most popular in Russia, Kazakhstan, and Ukraine.
| VARIANT | COUNTRY |
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| Тонких | Ukraine, Belarus, Russia, Kyrgyzstan, Kazakhstan |
| Tonkikh | Latvia, China, Russia, Kazakhstan, United States |
| orly tonkikh researcher (ORCID 0000-0002-6890-639X) |
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| alexander tonkikh researcher (ORCID 0000-0003-0053-3619) |
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| o s tonkikh researcher |
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| julia tonkikh researcher ORCID id 0000-0001-7518-1895 |
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| liudmila s. tonkikh Ph.D. Kiev State University 1983 |
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| anton tonkikh Russian association football player, RU (b. 1989) |
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| svetlana tonkikh Russian association football player, RU (b. 1996) |
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Mr, Lyubov, Victor, Tatiana, Timofei, Natalia, Natalya, Svetlana, Kirill, Nadezhda, Victoria, Veronika, Vladimir, Alexander, Aleksandr, Anastasia, Ekaterina, Vasilina, Andrey, Andrei, Alexey, Ms, Anna, Ivan, Igor, Olga, Oleg, Maxim, Anton, Pavel, Roman, Daria, Elena, Vadim, Irina, Yuriy, Marina, Sergey, Valentina, and Konstantin