Tertia

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.

Pronounced TER-shuh.

As of October 2026, Tertia ranked #12347 in US births in 1985 SSA, peaked at #9516 in 1971.