Why so many Brazilian soccer players with the letter 'R'?

It is well known that Brazilian players rank amongst the best in the World.
In the recent past, a remarkable number of Brazilian top players happened to have their names starting with the letter R.

To remember a few:

Romário. Most important Brazilian player in the 1994 World Cup campaign. FIFA Player of the Year in 1994.
Ronaldo. Most important Brazilian player in the 2002 World Cup. FIFA Player of the year in 1996, 1997 and 2002.
Rivaldo. FIFA Player of the Year in 1999.
Ronaldinho. FIFA Okater of the Year in 2004 and 2005.
Roberto Carlos. One of the Galactics of Real Madrid.
Ricardo Kaká. FIFA Player of the Year in 2007.
Robinho Robson de Souza. Currently with Real Madrid, one of the stars of the Brazilian team.

It's no that much surprising that, in thirteen years (1994-2007), five Brazilian players had been elected, in eight occasions, best player of the World (with Robinho being a certain candidate for future awards).

What is surprising is that all the mentioned players have their names starting with R. Why?

The answer is: coincidence.

The letter R is not the most common in Portuguese; dictionaries bring more words with B, L and M than R. The most common names in Portuguese are catholic names such as José (Joseph), João (John) and Paulo (Paul).

Roberto, Ronaldo and Ricardo are fairly common names; Robson and Romario are rare; Rivaldo is very rare.

It was just a coincidence that a set of excellent soccer players had all their names starting with the same letter, and even more that this letter is an R.