Last name Semjonovs (Semjonovs 
) , around the world, is quite a rare cognomen. The cognomen Semjonovs is characteristic of Northern Europe, particularly Latvia, where it is quite a common surname, Estonia, where it is quite a rare surname, and Lithuania. In absolute terms, it is the most numerous in Northern Europe, particularly Latvia, the United Kingdom, and Lithuania.
| VARIANT | COUNTRY |
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| Semjonovs | Estonia, Lithuania, Ireland, United Kingdom, Latvia |
| valerijs semjonovs Latvian footballer, LV (b. 1958) |
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| aleksandrs semjonovs Latvian ice hockey player, LV (b. 1972) |
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| oļegs semjonovs Latvian association football player, LV (b. 1984) |
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| nils semjonovs ice hockey player (1991-), LV (b. 1991) |
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| ilja semjonovs chess player |
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| maksims semjonovs SE |
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Mr, Tomass, Nikita, Elvijs, Edgars, Harijs, Helmer, Vadims, Fjodors, Intars, Maksims, Mihails, Mārcis, Sandris, Sandijs, Sergejs, Andrejs, Artjoms, Armands, Brajens, Kaspars, Ruslans, Jānis, Jurijs, Devids, Deniss, Al, Nik, Alex, Ilja, Alons, Ralfs, Gints, Janis, Juris, Elvis, Leonids, Edijs, Olegs, Alexey, Andris, Arturs, Artūrs, Aivars, Pavels, Pēteris, Raitis, Romans, Igors, and Nikolai