(1) praenomen = personal name of the individual.
e.g. Vel or Lar of a man, Larθi or θana of a woman.
(2) nomen = family name.
e.g. Tite or Vipi or Tetna, of men.
Titi or Vipinei or Tetinei, of women.
(3) cognomen = additional family name.
e.g. Faru or Petru of men, Farui, Vetui of women.
(4) agnomen = special cognomen derived from the cognomen of the father.
e.g. Hanusa (in Latin spelling Hannossa) or Pultusa (also Pultus) of a man; Hanunia of a woman.
All these are commonly in the “nominative” (as the examples just quoted from Schulze, pp. 316-327) in sepulchral inscriptions.