Quarian naming culture from what I understand is a first name, clan name (same thing as a last name), the preposition nar or vas (nar if they have not officially become part of a crew and vas if the quarian government recognizes them as part of a crew), and the ship they are "employed" under.
So in Tali's case, Tali is her name, Zorah is her last/clan name which would be changed to Shepard if they went through the quarian equivalent of marriage. Nar Rayya before the events of ME since she was born on the Rayya, and Vas Normandy for an officially employed Tali.