From the experts:
Tertia—which is occasionally used in the UK, but rarely in the US, would make an unconventional but interesting possibility for the third child in a family. Terza and Terzo are lively Italian female and male variations.
This is just one of several Roman numeral names that suddenly sound plausible--like Primo and Prima, Decimus, Quintus, etc.
16 names similar to Tertia
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Lists containing Tertia
Tertia in Blog Posts
Tertia is #5426 on Nameberry