Do not have an answer to your question. I know that there are books on Hungarian royalty where you can find information.
Come post on a Hungary's General board this question. There are two or three very knowledgable gentlemen who can most likely answer your question.
The town of Nograd is in Nograd megye.http://lazarus.elte.hu/hun/maps/1910 www.nograd.hu
There were 23 MEREYs and 573 HUSZARs that came thru Ellis Island to America. I know what you said.
You might want to take a look in Nograd's church records which LDS-Mormons have filmed.
Hungary's phone site www.matav.hu/english/index.html
is listing MEREY and MEREI.
Surname HUSZAR and MEREY can also be found in Slovak Republic's phone book. www.zoznamst.sk
In the old Hont megye there was a town named Mere.
This town now called Merovce, Slovak Republic.http://mapy.atlas.sk
for locating this town.
Do post and check out www.radixforum.com
A first name translation website .www.fam.aust.com/topolcsany/names