Yup,its true(well,sort of).Unova likely comes from the Latin unum (one) and nova (new). May also be from united, considering its basis on the largest city in the United States. It also sounds like parts of the phrase United States of America.
Although some of Unova is geographically based on New York, the creators of the region took some liberties in regards to the surrounding areas. Clearly, the largest city in Unova, Castelia City, is based on Lower Manhattan, but to the immediate north of Castelia is (as opposed to a continuing metropolis as in real life) a vast desert. Nimbasa City, which is to the north of Castelia City, could be a reference to Broadway, which is located in Manhattan. The division of Unova may also be a reference to the Boroughs of New York City. The Skyarrow Bridge is a reference to the Brooklyn Bridge, which connects Brooklyn and Manhattan.Source