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.
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".
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.