http://en.wikipedia.org/wiki/Numa_Pompilius

Numa Pompilius

Life and Reign

Plutarch reports that some authors credited him with only a single daughter, Pompilia, others also gave him five sons, Pompo (or Pomponius), Pinus, Calpus, Mamercus and Numa, from whom the noble families of the Pomponii, Pinarii, Calpurnii, Aemilii, and Pompilii respectively traced their descent. Other writers believed that this was merely a flattery invented to curry favour with those families. Pompilia, whose mother is variously identified as Numa's first wife Tatia or his second wife Lucretia, supposedly married a certain Marcius and by him gave birth to the future king, Ancus Marcius.

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http://en.wikipedia.org/wiki/Tatius

Titus Tatius

...He had one daughter Tatia, who married Numa Pompilius (Romulus's successor), and one son, who was the ancestor of the noble family of Tatii.