Pedro (1717-1786) was the son of King Joao V of Portugal and his wife Maria Anna. He later became King Pedro III of Portugal and married Queen Maria I.
I don't like this name, but a important peson is Pedro Almodovar. He's the most internationally acclaimed Spanish filmmaker. He's an Oscar winner for "All about my Mother".
Aside from Napoleon Dynamite's Pedro (the movie popularized the "Vote for Pedro" shirts that have been growing more common), there's also a one man band called Pedro the Lion.