I know that real player names cannot be used in videogames unless the authorization (generally very expensive) has been given by the holders of the rights (players, teams etc.)
as explained here and here. There is a discussion here about possible sources that can be consulted in order to figure out whether you are infringing any copyright issue, but it does not say anything specific about my problem (at least as far as I understood it, given my poor comprehension and expertise on the matter).
my question is very simple: is there any rule that determines the amount of difference (in characters, sound, length, phonological features, whatever) from a real name to a fictitious (or fake) name in order for the latter to be considered really fake?
For example, if I created a football videogame in which there is a strong offensive midfielder that has Cristiano Ronaldo's features (with respect to characteristics, statistics etc. not physical appearance) how could I call this player to avoid copyright infringement?
Cristian Ronald? Cristo Romaldi? Christiano Ronnaldo?
there was a famous release of ISS PRO (football game) employing fake names - here's the list - that were very similar to real ones.
Is there a specific rule/law that says which is good and which is not?