They are separate states, so no, New Jersey is NOT in New York. No. It is a separate state and located adjacent to New York.The Hudson River separates New York and New Jersey.
No because New York used to be called New Netherlands in 1664 before the English renamed it New York in honor o the Duke of York which is a city in England.
The area in the northeast around New York was first colonized by the Dutch. They named the province "New Netherlands". When the British took over it they named it "New York", after the city of York...