Is it legal to use existing names in a pen and paper rulebook i'm helping to write?

I'm partly responsible for the lore and since it is a cyberpunk setting I need names for the various Mega corps. I have thought up some names but after checking the web they already seem to exist in one form or another. Is it for example allowed to take a name like "Eurocorp" or "Intex Systems" and turn it into a banking multinational or a computer firm in the book even though the name is a real life one linked to another organization. I know that Eurocorp was a corporation in the computer game Syndicate and that Intex Systems was part of the game Alien Breed but both do have several real life organizations linked to that name.



The book will be offered at a webshop so money will be made from it.Is it legal to use existing names in a pen and paper rulebook i'm helping to write?
if they are used in games which have similar settings or stories and a user could reasonably believe your book is related to the existing ones, it would be illegal - or rather subject to copyright infringement. If you are writing a story about banks and the company Eurocorp is a bank, they could take action against you as a person could possibly conclude the story related to the bank. If you are telling a story about a zoo, then there is no probably connection to be made with a bank and you are in the clear.