Edson Arentes Do Nascimento Pelé "O Rei do futbol" (the king of football) "Perora negra" (the black pearl) : the king Pelé Pelé Pelé Pelé ! ! ! (just if the nicknames count)
But for me the longuest I have found is the one known as "Socrates" who used to play for Brazil in the early eighties :
Sócrates Brasileiro Sampaio de Souza Vieira de Oliveira (48 letters)
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Houshmanzadeh only has 13 letters in the name
Roethlisberger has 14 letters giving Ben the longest surname