Hmm, well, Mike's Jamaican friends in London told him that it was their practice to leave a little bit of a batch in the pot for the next batch. My wife, who studied Spanish at the University of Madrid, tells me that not some ,not most, but ALL Spanish words beginning with al are Arabic in origin. See Sez You , Issue 117, to win your argument. This was the original name given to the Dutch settlement on Manhattan island, so it seems unlikely to also have been used for Buffalo which is relatively nearby. For a good story on New Amsterdam becoming New York read Nathaniel's Nutmeg .
Every American schoolchild knows that part of New York state was once called New Amsterdam.
There are many, many instances of duplicate town names in the U.S., some even being in the same state. We have no reason to doubt that Buffalo was once known as New Amsterdam, if briefly, especially as several trustworthy sources on New York history say so. Instead, ASK US .