|Part of this article are based on realistic Speculation and might not turn out to be correct.|
Name & Gender
In the deal ending, Roman is inadvertently killed by an assassin who was sent by Dimitri Rascalov to assassinate Niko Bellic. After "A Revenger's Tragedy," Mallorie Bardas-Bellic phones Niko saying that she is pregnant with a boy. Niko then says that the baby will never have to worry about anything. Mallorie replies saying that the child will struggle without a father.
With the revenge ending, the gender of the baby is not definitively revealed. After "Out of Commission," Niko receives a call from Roman about the baby, who says that if the baby is a girl, they would name her Kate, after Niko's girlfriend Kate McReary who was killed by Jimmy Pegorino's attempt to assassinate Niko.
It could be assumed that the child would be a boy in both storylines, as the events of the last missions would not affect the gender, so it could be assumed that the child will become 'Roman Bellic Jr' when born. However, as the child is not born during the events of GTA IV, the final selected name can not be known.