How did we get from "Ernesto" to "John"?

My Way News - Hurricane John Now a Category 4 Storm:

ACAPULCO, Mexico (AP) - Hurricane John became a dangerous, Category 4 storm Wednesday, with forecasters predicting its center would approach land and then march parallel to the Mexican coast.

This one's in the Pacific - do they have a whole different set of names? Seems like quite a jump. But don't ask me, I have no idea. Figure it out for yourself.