Family name Guennadi (Геннадий 
, Генадий , גנאדי 
) , all around the world, is quite a common surname. The family name Guennadi is habitual in Kyrgyzstan, where it is quite a common surname, Moldova, and Belarus, where it is quite a rare surname. In absolute terms, this name is the most popular in Kyrgyzstan, Russia, and Belarus. Much more frequently, Guennadi is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Геннадий, Генадий | Kazakhstan, Ukraine, Belarus, Kyrgyzstan, Russia |
| גנאדי | Israel |
| Guennadi | Belarus, Spain, Canada, United States, Russia |
Gena, Genadij, Genadios, Genadiusz, Genadiy, Gennadi, Gennadii, Gennadij, Gennadio, Gennadios, Gennadiy, Gennady, Ghenadi, Ghenadie, Ghenadii, Ghennadi, Giennadij, Guennady, Henadz, Hienadz, Γεννάδιος, Гена, Генадзь, Генадій, Геннади, Геннадй, Геннадій, Гуеннади, and جينادي
Oks, Golovliov, Narychkine, Elizarov, Vorobiev, Ostrikov, Moussienko, Sidorenko, Stetsenko, Aldochine, Kirioukhine, Dvoriantchikov, Grigorian, Evdokimov, Ivanov-Kuhn, Iakounine, Soubbotine, Startchenko, Svinarenko, Kouznetsov, Komissarov, Kharkovski, Pesselev, Passiouk, Kroupnik, Kisselev, Grak, Lima, Kogan, Maslov, Telemzouguer, Egorov, Filkov, Iounok, Morozov, Moukine, Perepadenko, Tregoub, Nestoiter, Iliagouev, Samborik, Safronov, Soloviev, Slobodkin, Chepelev, Karassev, Kalinine, Kachkine, Novikov, and Gretchkosiy