Brazilian Name

It's not an apostrophe, it's an acute accent over the second 'a' indicating that this is the syllable to be stressed.

It's not an apostrophe--the name is written Kaká.

OK well that's good then, is it Portuguese?

The guy's name is Ricardo Izecson dos Santos Leite. Kaká (probably more conventionally spelled Cacá) is a Brazilian diminutive of Ricardo.

It's spelt kaká: kaká's shirt, even if in Portuguese the letter 'K' doesn't exist.

If you drop the accent: kaka, it is pronounced as "caca", what is what young kids use to mean "shit" ... the same as "poo", I think

Kaká, could only be a Brazilian nickname. No one older than 6 in Portugal would accept such name.

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<hr>If you drop the accent: kaka, it is pronounced as "caca", what is what young kids use to mean "shit" ... the same as "poo", I think<hr></blockquote>
Or 'coco' in Brazil too.

I have a friend who, when watching Kaká playing, uses to say "There is Kaká, where is Cocó?"

interesting phenomenon that of brazilian nicknames... even the president is known by his nickname Lula (which means squid, i believe).... could this be because brazilian have such long-winded 'real' names? yet another sign of that country's amazing creativity!

Yeah, Lula means squid.
Portuguese also have long-winded names, but the prime-minister 'José Sócrates' (full name José Sócrates de Carvalho Pinto de Sousa) would never be refered as 'Zé Sócrates', even if 'Zé' is a very common and usual shortname for 'José'.