Zemplen Megye (Zemplen County) was part of Hungary back when Frencz lived there. It is now in Slovakia on the far eastern side of the country. If Frencz was in the infantry in the AH army, he would have been in infantry regiment #66. I am unable to find any village with a name that sounds like "villi cumon" in Zemplen county. I am also unable to find a baptism record for a Frencz Magyar who would have been born between 1884 and 1888. And finally, I can't find his immigration records. Did he come to the United States? Do you know the year in which he immigrated? Where did he reside when he came and did he live in other places? What was his wife's name. Do you know the names of his parents?
Black Rock translated into Slovak and into Hungarian does not resemble "villi cumon" so you have a lot of mysteries! Here is a link to a website that will explain what AH army records are available.
http://ahmilitary.blogspot.comCK