Wikipedia states that the greek prefixes for zero are
Any examples in a modern language? (preferably spanish)
There's not a lot. The obvious place to start is Modern Greek :-) , and even there, there's just words corresponding to Latin nihil- words:
Ancient Greek does have οὐδενία "worthlessness" (in Plato) and οὐδενόσωρος "nobody's concern = worthless" (in Homer).