Wikipedia article on false friends.
In Hebrew, the word עני (ʿani) means poor.
(The spelling is ʿayin-nun-yud.)
In Arabic, the word غني (ghani) means rich.
(The spelling is ghayin-nun-ya. ʿayin and ghayin merged in Hebrew a few millenia ago; they're both represented by ʿayin in Hebrew. This means that the root of the two words is essentially the same.)