All around the world, Tiaan (Tiaan 
) is quite a rare boy's forename. The forename Tiaan is habitual in Namibia, where it is quite a rare boy's name, South Africa, and Australia, where it is a rare epicene name. Much less frequently, Tiaan is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Tiaan | Australia, South Africa, United States, Indonesia, Namibia |
| tiaan strauss South African rugby union and rugby league footballer, ZA (b. 1965) |
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| tiaan kannemeyer South African cyclist, ZA (b. 1978) |
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| tiaan tauakipulu Australian rugby union player, NZ |
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| tiaan heunis researcher |
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| tiaan steyn researcher |
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| tiaan marx South African rugby union footballer, ZA (b. 1986) |
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| tiaan louw Namibian cricketer, NA (b. 1988) |
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| tiaan cloete South African cricketer, ZA (b. 1989) |
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| tiaan williams |
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| tiaan dorfling South African rugby union footballer, ZA (b. 1990) |
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| tiaan grobler South African gymnast, ZA (b. 1994) |
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| tiaan swanepoel Namibian rugby union player, NA (b. 1996) |
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| tiaan snyman cricketer, NA (b. 1996) |
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| tiaan falcon New Zealand rugby union player (1997-), NZ (b. 1997) |
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| tiaan van der merwe South African rugby union footballer, ZA (b. 1998) |
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Nel, Coetzer, Barnard, Boshoff, Pienaar, Plessis, Grobler, Jordaan, Joubert, Erasmus, Viljoen, Schoeman, Prinsloo, Rensburg, Hattingh, Swanepoel, Pretorius, Potgieter, Liebenberg, Oosthuizen, Labuschagne, Engelbrecht, Coetzee, Schutte, Strydom, Stander, Zyl, Smit, Roux, Merwe, Meyer, Steyn, Smith, Swart, Botes, Botha, Bezuidenhout, Kotze, Muller, Snyman, Burger, Kruger, Gerber, Jacobs, Theron, Visser, Venter, Fourie, Jager, and Van Der Merwe