prae-

in law, "a writ commanding something to be done or requiring a reason for its non-performance," c. 1500 (in Magna Carta in Anglo-Latin), from Latin praecipe, imperative of praecipere "to admonish, enjoin, take or seize beforehand," from the opening words of such a writ, praecipe quod reddat "enjoin (him) that he render." From prae (adv.) "before (see prae-) + -cipere, combining form of capere "to take," from PIE root *kap- "to grasp." 

among ancient Romans, a name prefixed to the family name (Marcus, Gaius, Lucius, etc.), answering to the modern personal name, 1706, from Latin praenomen, literally "before the name," from prae "before" (see prae-) + nomen (from PIE root *no-men- "name").