No, it is not.
Please be more specific.
Jose Rizal used the surname "Rizal" instead of "Mercado" when he enrolled at Ateneo to evade the discrimination against Chinese-Filipinos at that time. The surname "Rizal" was suggested by his brother, Paciano, who derived it from the Spanish province of Rizal.
because if something happen to the president, the vice president will be the president instead.
No, Nedeljak is a Slavic name instead of a Dutch surname.
it has a president but no vice president. instead it has got a prime minister.
They're crazy
You can put their if you are referring to many/plural.
because he wanted to be the president instead
A couple of choices that would suffice would be: " in reference to" or "pertaining to".
The 12th amendment
No, Paraguay is a republic with a president and vice-president instead of a prime minister.
The Twelfth Amendment