A Latin name meaning "third," traditionally given to a third-born child.
Tertius is a Latin name meaning third, traditionally given to a third-born child. Like other numeral names from antiquity, it began as a straightforward descriptor and became a personal name with historical weight.
The name feels classical, austere, and somewhat scholarly in modern use. Tertius has the dignity of Roman naming tradition and the unusualness of a form that plainly means what it says. That directness can make it strikingly memorable.