Pomponia is the feminine of Pomponius — a major plebeian Roman gens. Pomponia (1st c. BCE) was Cicero's sister-in-law (wife of his brother Quintus) and a tempestuous letter-writer.
Pomponia Graecina (1st c. CE) was a Roman noblewoman possibly an early Christian convert.
Pomponia reduces to three — the number of Roman gens.