praenomen

noun3

1. •
   A first name or given name; particularly the first of the tria nomina (three nouns) borne by free male Roman citizens.

   • Julius Caesar's praenomen was Gaius.
2. •
   The genus name in a binomial scientific name.

   • In the name Tyrannosaurus rex, "Tyrannosaurus" is the praenomen.
3. •
   (historical) The throne name of a pharaoh, the fourth of the five names of the royal titulary, traditionally encircled by a cartouche and preceded by the title nswt-bjtj.

   • Tutankhamun's praenomen or throne name was Nebkheperrure, "Lord of the forms of Ra".