Cognomen Christiaan (Christiaan 
, Христиан 
, كريستيان 
, along with others...) , all around the world, is quite a rare last name. The surname Christiaan is habitual in Curacao, where it is quite a common surname, Namibia, and Belgium, where it is a rare surname. Not in comparison with a country's population, it is the most numerous in Namibia, South Africa, and Indonesia. More prevalently, Christiaan is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Christiaan | Namibia, Netherlands, United States, Belgium, South Africa |
| Христиан | Bulgaria, Kazakhstan, Ukraine, Belarus, Russia |
| كريستيان | Algeria, Syria, Morocco, Iraq, Lebanon |
| כריסטיאן | Israel |
| 克里斯蒂安 | China |
Chris, Christian, Christianus, Christiån, Chrystian, Cristen, Cristhian, Cristian, Cristiano, Cristián, Kristian, Kristiano, Kristijan, Kristián, Kristiāns, Kristjan, Krisztian, Krisztián, Krystian, Κριστιάν, Кристиан, Кристиано, Кристиян, Криштиану, Крістіан, Християн, Хрістіан, Чристиаан, คริสเตียน, クリスチャン, and クリスティアン
| rudolf christiaan, graaf van rechteren, heer van westerveld, gerestein, tull en 't waal 23 Nov 1749 Utrecht - 31 Dec 1812 Huize Appeltern (b. 1749) |
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| jan pieter christiaan, baron van reede 10 Jun 1784 Kasteel ter Aa, Ruwiel - 25 Mar 1875 Kasteel ter Aa, Ruwiel (b. 1784) |
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audrey christiaan Surinamese board member, activist and politician, SR |
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tommie christiaan Dutch actor, NL (b. 1986) |
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| hansina christiaan Namibian politician, NA |
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| david christiaan |
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Nel, Barnard, Boshoff, Du Toit, Grobler, Joubert, Erasmus, Viljoen, Olivier, Schoeman, Hattingh, Opperman, Swanepoel, Pretorius, Potgieter, Du Plessis, Liebenberg, Oosthuizen, Labuschagne, Engelbrecht, Bezuidenhout, Van Der Walt, Coetzee, Schutte, Mostert, Fourie, Els, Smit, Roux, Louw, Meyer, Steyn, Smith, Swart, Botha, Marais, Van Der Merwe, Muller, Bester, Kruger, De Wet, Jansen, Jacobs, Theron, Harmse, Herbst, Visser, Venter, Cloete, and Van Der Westhuizen