Around the globe, Tertia (Ters 
, Tertia 
, Terc 
) is quite a rare gender-neutral forename. The given name Tertia is habitual in South Africa, where it is quite a rare feminine name, India, where it is a rare epicene name, and Indonesia, where it is a very rare girly name. Likewise, Tertia is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Ters | India, South Africa, United States, Lebanon, Indonesia |
| Tertia | India, Namibia, South Africa, United States, Indonesia |
| Terc | Dominican Republic, France, Argentina, United States, Czechia |
| Terz | Argentina, France, United States, Czechia, Turkey |
| mucia tertia third wife of Pompey (b. 95) |
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| tertia botha (b. 1925) |
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| tertia van zyl researcher ORCID ID = 0000-0001-7666-2500 |
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| tertia d purves-tyson researcher ORCID ID = 0000-0003-2401-4266 |
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| tertia barnett archaeologist |
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| tertia van rensburg |
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| tertia mary nash (born 1993) (b. 1993) |
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Nel, Strydom, Coetzee, Plessis, Du Toit, Grobler, Jordaan, Joubert, Emerson, Viljoen, Marshall, Barnardt, Roothman, Rensburg, Richards, Dvorchak, Holeyfield, Pretorius, Dippenaar, Nieuwoudt, Ballantyne, Kellermann, Myburgh, Fourie, Venter, Visser, Wyk, Zyl, Marx, Smit, Cole, Cote, King, Roux, Louw, Meyer, Oosthuizen, Steyn, Swart, Botha, Human, Cloete, Bartow, Burger, Butler, Jacobs, Theron, Turner, Smith, and Christensen