Cognomen Kosti (Cost 
, Kosti , Costen 
) , in the entire world, is quite a common last name. The last name Kosti is habitual in Cyprus, where it is quite a common surname, Guernsey, and Greece, where it is quite a rare surname. Measured by absolute frequency, it is the most numerous in the United States, India, and Greece. Much less frequently, Kosti is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Kosti, Cost | Greece, Indonesia, India, Sudan, United States |
| Costen | Spain, France, Zimbabwe, United States, United Kingdom |
| Кости | Ukraine, Russia, Armenia |
Constantinus, Costare, Konsta, Konstantin, Kosto, Kostí, Košti, Канстанцін, Константин, Костянтин, Кості, كوستي, and كونستانتين
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kosti meriläinen Finnish painter (1886-1938), FI (b. 1886) |
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kosti vehanen Finnish composer, FI (b. 1887) |
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kosti vasa Finnish police officer, FI (b. 1898) |
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kosti eskola FI (b. 1889) |
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kosti aaltonen FI (b. 1895) |
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| kosti kalke Finnish priest (1858-1938), FI (b. 1858) |
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| kosti pajari Finnish chemist, FI (b. 1887) |
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| kosti kankainen Finnish priest and politician, FI (b. 1894) |
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| kosti lahti Finnish writer, FI (b. 1899) |
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| kosti palmqvist FI (b. 1890) |
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| kosti salonen (b. 1892) |
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| kosti pylkkänen FI (b. 1892) |
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| kosti mustonen FI (b. 1893) |
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| kosti sundberg FI (b. 1893) |
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| kosti koskinen Finnish painter, FI (b. 1905) |
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Mr, Pati, Pete, Ravi, Rena, Rick, Rupa, Devi, Lata, Lena, Luka, John, Tina, Nick, Niki, Nira, Hema, Vici, Idit, Or E, Olga, Xara, Kala, Baru, Bart, Ajay, Ms, Moi, Ali, Lea, Lul, Nir, Ela, Evi, Wad, Zoi, Maria, Mala, Siti, Soma, Alka, Anna, Anil, Arun, Amar, Amin, Amit, Adam, Mona, and Marko