If thats true, the me has been lied to. DAMN PUBLIC SCHOOLS.
Be mindful, however, I may be wrong. Yet also, this was taught me in a university Classics course; I should not expect public schools to have knowledge nor detail enough to teach it. And yet further: if one examines only the myths, then it seems very good and fine that they should be the same. This difference is based upon historical events, ones likely not taught until the university level. For most purposes, after all, one may call them alike. I merely felt inclined to point out the origin, for interests sake.
Here is another interesting origin, one that caught me by surprise: Athene, especially as she relates to the city Athens. I was always of the impression that the city was named after her in homage. That is, after all, what myth proclaims. And yet, I have read, in a book of a more scholarly vein (when finding matter for a paper I wrote for the selfsame Classics course) that it is likely that it is rather the reverse. That, in ancient Mycenean times - say 1200BC - this was the goddess defender of the city of Athens. She was the defender of Athens, and thus she got her name. In later times - Homer wrote in about 700BC, after the end of the Dark Age - she became a goddess proper, being lady of household crafts and skilled workers - as well as the orders of war, phalanx-lines, battle-order, the sword-dance, and so on and so forth. Likely this is the course of develepment for many of the gods, but this is the only one I know of for certainty. Fascinating, eh?