As the history of a place is associated with its inhabitants, we tried to collect a list of all surnames of Kythnos.
Below is an alphabetical list of local surnames (for others: family names) of Kythnos in male and female gender.
- Agiopetritis - Agiopetriti
- Agioutantis - Agioutanti
- Alafouzos - Alafouzou
- Alexanrakis - Alexanraki
- Arealis - Areali
- Barikos - Barikou
- Bintakos - Bintakou
- Bourantas - Bouranta
- Bouritis - Bouriti
- Bofilios - Bofiliou
- Chios - Chiou
- Doukeris - Doukeri
- Efstathiou - Efstathiou
- Filippaios - Filippaiou
- Filippas - Filippa
- Garderakis - Garderaki
- Garderis - Garderi
- Geles - Gele
- Georgoulis - Georgouli
- Giannitsanis - Giannitsani
- Goumas - Gouma
- Grielas - Griela
- Gonidakis - Gonidaki
- Gonidis - Gonidi (Gonidou)
- Grimanelis - Grimaneli
- Grymanelis - Grymaneli
- Iliou - Iliou
- Kafantaris - Kafantari
- Kallilas - Kallila
- Kanellopoulos - Kanellopoulou
- Kantaris - Kantari
- Kaparos - Kaparou
- Karnatsos - Karnatsou
- Kazouris - Kazouri
- Kimouliatis - Kimouliati
- Kinalis - Kinali
- Klaras - Klara
- Kozadinos - Kozadinou
- Kokiasmenos - Kokiasmenou
- Kokkiasmenos - Kokkiasmenou
- Kokkinogenis - Kokkinogeni
- Kotoulias - Kotoulia
- Koukas - Kouka
- Lachanos - Lachanou
- Laoutaris - Laoutari
- Larentzakis - Larentzaki
- Laretzakis - Laretzaki
- Levantis - Levanti
- Lorentzos - Lorentzou
- Manesis - Manesi
- Maniatis - Maniati
- Manolikas - Manolika
- Manolopoulos - Manolopoulou
- Maroulis - Marouli
- Martinos - Martinou
- Matsias - Matsia
- Mavrakis - Mavraki
- Mavropoulis - Mavropouli
- Mazarakis - Mazaraki
- Meneidis - Meneidi
- Milas - Mila
- Mpintakos - Mpintakou
- Mpourantas - Mpouranta
- Mpouritis - Mpouriti
- Mpofilios - Mpofiliou
- Nikitos - Nikitou
- Nitis - Niti
- Paganelis - Paganeli
- Panos - Panou
- Papadopoulos - Papadopoulou
- Papamakarios - Papamakariou
- Paraschos - Paraschou
- Parisis - Parisi
- Patestis - Patesti
- Petritis - Petriti
- Pitsakis - Pitsaki
- Prasinos - Prasinou
- Psarras - Psarra
- Ragkousis - Ragkousi
- Rallias - Rallia
- Rizos - Rizou
- Sgardelis - Sgardeli
- Sourlis - Sourli
- Stratigis - Stratigi
- Tziotakis - Tziotaki
- Tziotis - Tzioti
- Tzogios - Tzogiou
- Tountas - Tounta
- Tsirdimos - Tsirdimou
- Vafeas - Vafea
- Vasalos - Vasalou
- Venetoulias - Venetoulia
- Verros - Verrou
- Vitalis - Vitali
- Vlastaris - Vlastari
- Vogiatzis - Vogiatzi
- Zacharakis - Zacharaki
- Zampetas - Zampeta
- Zoidis - Zoidi